The GPO Evaluation Playbook
Comparing and selecting a group purchasing organization
Every GPO pitch sounds the same. This playbook helps you cut through the noise to evaluate cost structures, category fit, and service quality so you choose a partner that actually delivers.
6 Benefits
to consider beyond headline savings percentages
7 Criteria
that separate strong GPOs from weak ones
Full Checklist
with questions to ask during your evaluation
- Every GPO pitch sounds the same. Evaluation requires asking specific questions, not comparing marketing claims
- Fee structures are the single biggest factor affecting your net savings — understand them before anything else
- Savings averages are aggregated across thousands of members and hundreds of categories; only a real cost analysis against your data tells you what you'll actually save
- Vertical GPOs serve industry-specific needs; horizontal GPOs cover common indirect categories across all industries
- The best GPOs act as an extension of your procurement team — not just a directory of supplier discounts
- Transparency, no lock-in, and responsiveness are the most reliable signals of a trustworthy partner
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See How Una Answers the Checklist
Free membership. 2,500+ contracts. Responsive Sourcing Advisors. No minimums, no purchasing obligations.
Introduction
Every GPO pitch sounds roughly the same. Billions in combined purchasing power, pre-negotiated contracts, average savings in the high teens or low twenties, no cost to join. On paper, the category looks commoditized, and it's tempting to treat the decision as low stakes. Pick one, sign up, start saving.
That instinct undersells what's actually at stake. The GPO you choose shapes which categories you can offload, how much control you retain over supplier relationships, whether your net savings survive contact with hidden fees, and how much genuine support you get once the initial contracts are signed.
Get this decision right and you gain a long-term extension of your procurement team. Get it wrong and you end up locked into commitments that limit flexibility, paying fees that erode the savings you were promised, or working with a supplier network that doesn't actually cover the categories you need.
This playbook walks through how to evaluate GPOs properly: what the real cost structures look like, how to match a GPO type to your actual spend profile, which benefits matter beyond the headline savings percentage, and what good looks like when you find the right partner. It closes with a checklist you can use directly when comparing options side by side.
Why The GPO Evaluation Decision Matters
Procurement teams are under sustained pressure to deliver savings faster, improve spend visibility, and reduce risk all while headcount stays flat or shrinks. Indirect spend categories like office supplies, shipping, food service, uniforms, and facilities maintenance often get the least attention because lean teams don't have the bandwidth to run a full sourcing event for every category.
A GPO exists to close that gap. Done well, it gives you immediate access to competitively negotiated contracts across categories you'd otherwise deprioritize, freeing your internal team to focus on strategic sourcing and supplier relationships in the categories that matter most to the business.
The GPO you choose shapes which categories you can offload, how much control you retain over supplier relationships, whether your net savings survive contact with hidden fees, and how much genuine support you get once the initial contracts are signed.
Get it right and you gain a long-term extension of your procurement team. Get it wrong and you end up locked into commitments that limit your flexibility.
Why GPO Evaluation Is Harder Than It Should Be
Comparing GPOs is genuinely difficult, for a few consistent reasons that are worth understanding before you start.
Fee structures are rarely presented in comparable terms.
One GPO might describe itself as free while quietly building in minimum purchase requirements or long-term commitments. Without asking directly, you can't tell which one actually nets out cheaper for your business.
Category coverage varies significantly.
A GPO's supplier portfolio might be broad on paper but shallow in the categories your business actually spends heavily in. A hospitality-focused vertical GPO won't help much if your biggest indirect spend categories are office supplies and IT equipment.
Savings claims are aggregated and can be misleading.
An average savings figure across thousands of members spanning hundreds of categories tells you very little about what you'll actually save on your specific spend profile. The only way to know is a real cost analysis against your own data.
Qualitative differences are the hardest to evaluate.
Responsiveness, dedicated support, category expertise — these only become clear once you ask the right questions or talk to existing members. They're also frequently the factors that determine whether you get value from the partnership long-term.
At Una, membership is free with no onboarding fees, no annual dues, and no minimum purchase requirements, so there's nothing buried for you to uncover later. Every member decides which of the more than 2,500+ pre-negotiated contracts to use, category by category, with no obligation to participate beyond what actually saves you money.
Where a lot of GPOs make evaluation hard on purpose, Una's approach is to make it straightforward: transparent fees, full category breadth across common indirect spend, and a dedicated sourcing team.
Understanding Cost Structures: How GPOs Make Money
Before comparing anything else, understand how a prospective GPO actually generates revenue. This single factor affects your net savings more than almost anything else in the evaluation. Most GPOs use one or more of the following models:
MOST MEMBER-FRIENDLY
Supplier Administrative Fees
When a purchase happens through a GPO contract, the supplier pays the GPO a small percentage of the transaction value. You pay nothing extra, and the GPO's incentive is aligned with yours: the more you save and the more you buy through their contracts, the more they earn. This model tends to produce genuinely free membership with no direct cost to you. This is Una's model.
Member Fees
Some GPOs charge directly through one-time onboarding fees, annual membership dues, or participation fees tied to your spend volume. These fees reduce your net savings dollar for dollar and need to be weighed against the pricing advantage on offer. A GPO with member fees can still be worth it if the negotiated pricing is strong enough, but take the headline savings percentage at face value only after the math confirms it.
Minimums and Commitments
This is the model that catches the most people out. A GPO might advertise free membership but bury minimum purchase requirements, long-term commitments, or penalties for low utilization in the contract terms. These structures limit your flexibility and can complicate your broader category strategy especially if your spend fluctuates or you want to maintain optionality across suppliers.
Six Questions Worth Asking
- How exactly do you make money — supplier fees, member fees, or both?
2. Are there any onboarding costs, annual dues, or participation fees?
3. Is there a minimum purchase requirement or volume commitment?
4. What happens if we don't hit that minimum — penalties, tier changes, or nothing?
5. Can we cancel membership at any time, and are there costs to doing so?
6. Do you charge for the cost analysis or benchmarking process upfront
A transparent answer to all six is a strong positive signal. Vague or deflected answers, particularly around minimums and cancellation terms, are a warning sign worth taking seriously.
Vertical vs. Horizontal GPOs: Matching the Model to Your Needs
GPOs generally fall into two categories:
VERTICAL GPO
Single-Industry Focus
Concentrates on one sector and offers deep category expertise for industry-specific purchasing needs — clinical supplies, specialized equipment, or compliance requirements that generalist GPOs can't address well.
Examples: healthcare, hospitality, dental, veterinary
HORIZONTAL GPO
Cross-Industry Indirect Spend
Spans industries and concentrates on indirect spend categories common to nearly every organization. Because these categories are universal, horizontal GPOs can aggregate meaningful volume and negotiate strong pricing regardless of member industry.
Examples: office supplies, shipping, food service, JanSan, MRO, uniforms, travel
The decision comes down to your spend profile. Map your indirect categories and ask two questions for each: how much do we spend here, and how specialized is this category to our business?
Common indirect goods and services are ideal for a horizontal GPO. Categories highly specific to your industry or core to your competitive position are usually better served by internal strategic sourcing or a vertical GPO if one exists for your sector.
Many organizations use a horizontal GPO for common indirect categories while keeping direct and highly specialized spend under internal management. That combination is often the most effective approach rather than trying to force one model to cover everything.
Benefits Beyond Cost Savings
Cost savings get top billing in every GPO conversation, and for good reason. But if that's the only benefit you're evaluating, you're missing most of the value a strong GPO partnership actually delivers. Ask what each GPO on your shortlist offers in each of these areas.
Speed to Savings
Pre-negotiated contracts mean you skip the RFP process entirely for the categories a GPO covers. What might take months of sourcing events and internal alignment can instead take weeks — sometimes days — from signing to first discounted purchase.
Category Management Capacity
A GPO effectively brings in additional category managers for nonstrategic or tail spend that your internal team doesn't have bandwidth to cover. If you're currently ignoring categories altogether because no one owns them, that's very likely leaving savings on the table.
Data, Analytics & Cost Comparison
A proper cost analysis benchmarks your actual spend data against the GPO's contract terms, giving you a clear, evidence-based picture of savings potential rather than a generic average. This is distinct from a marketing estimate.
Supply Chain Resilience
Because a GPO already has contracts and supplier relationships in place, it gives you additional sourcing options during shortages or disruption without having to scramble to vet a new supplier from scratch under time pressure.
Freed Internal Capacity
Every category a GPO manages on your behalf is time your internal team gets back for higher-value work: supplier relationship management, category strategy, and cross-functional projects that only an internal team can really own.
Price Protection
Strong GPO contracts often lock in pricing for multiple years, insulating you from some of the volatility that comes with market-rate purchasing, making financial planning more reliable and reducing spot-rate exposure.
Case Studies: What Good GPO Results Look Like
Aggregate savings statistics tell you little. These two cases show what a well-matched GPO partnership actually delivers in practice.
CASE STUDY - BEHAVIORAL HEALTH NETWORK
27% average savings across categories within weeks
A growing behavioral health facility network operating multiple facilities across several states had no formal procurement function and rising costs across food, office supplies, uniforms, and JanSan. Working with the GPO's sourcing team, it quickly connected to pre-negotiated contracts that delivered measurable impact across categories within weeks of joining.
27%
49%
22%
20%
Staff Uniforms
20%
Janitorial & Maintenance
CASE STUDY - NATIONAL MEAL PROGRAM OPERATOR
Up to 15% food cost savings without replacing local supplier relationships
A meal program operator delivering chef-driven food service to more than 150 chapters across 26 states faced rising costs from national distributors despite having strong existing local supplier relationships. Rather than replacing those relationships, the organization needed to augment its sourcing capability with national contracts that delivered better pricing where it mattered most.
The combination of existing category expertise and GPO-negotiated contracts with major distributors delivered up to 15% savings on food costs. Local vendor relationships remained fully intact. On-site chefs gained optional access to GPO-backed contracts at the point of order — free of charge, without long-term commitments.
7 Evaluation Criteria
These seven criteria separate a strong GPO from a weak one when you're comparing options side by side. A GPO that scores well on all seven is a different proposition than one that scores well on only the first two.
1.
Transparency
Every fee, minimum, and commitment is disclosed clearly, in writing, before you sign anything. If you have to dig for the answer or the sales team deflects the question, treat that as a signal about how the relationship will run once you're a member.
2.
No forced lock-in
You retain the ability to choose which contracts to use, maintain direct supplier relationships where you want to, and cancel membership without penalty if the fit isn't right. Control should stay with you.
3.
Genuine category breadth in your priority areas
Ask for the specific supplier list in your top three or four indirect spend categories, not just the total number of contracts across the whole portfolio. Breadth on paper is meaningless if the GPO is shallow in the categories you actually spend heavily in.
4.
Responsiveness
How quickly does the sourcing team respond to an initial inquiry? A GPO that takes days to respond during the sales process is unlikely to speed up once you're a member. Response speed during evaluation is a reliable proxy for ongoing service quality.
5.
Real category management support
Look for evidence of dedicated sourcing advisors and ongoing account support — not just a self-service contract portal. The best GPOs act as a genuine extension of your procurement team, not a directory of supplier discounts you have to navigate alone.
6.
A track record with organizations like yours
Case studies and references from businesses of similar size and spend profile tell you far more than aggregate savings statistics. Ask specifically for examples from organizations with comparable headcount, industry, and indirect spend categories.
7.
Fast, evidence-based onboarding
A proper cost analysis benchmarks your actual spend data against real contract terms and not a generic estimate based on industry averages. This gives you a clear, evidence-based picture of savings potential before any commitment is made.
The GPO Evaluation Checklist
Use this checklist directly when comparing GPO options side by side. Print it, copy it, or work through it with your team before any final decision.
Cost Structure
5 Questions
How does the GPO generate revenue — supplier fees, member fees, or both?
Are there onboarding costs, annual dues, or participation fees?
Is there a minimum purchase requirement, and what happens if you don't meet it?
Can you cancel at any time without penalty?
Does the initial cost analysis come free of charge?
Category Fit
3 Questions
Is a vertical GPO a better fit given your industry, or does a horizontal GPO cover your needs?
Does the GPO's supplier portfolio genuinely cover your top indirect spend categories?
How many suppliers are available in your highest-spend categories specifically?
Savings and Value
3 Questions
Has the GPO run a cost analysis against your actual spend data — not just industry averages?
What percentage savings does that analysis show for your specific categories?
Does the GPO offer price protection or multi-year pricing locks?
Support and Service
3 Questions
Will you have a dedicated point of contact or sourcing advisor?
What category management or data analytics support is included?
How quickly does the team respond during the sales and onboarding process?
Flexibility, Control and Track Record
5 Questions
Can you maintain existing supplier relationships alongside the GPO contracts?
Do you retain full control over which contracts to use and when?
Is there a clear path to add or drop categories as your needs change?
Can the GPO provide case studies or references from organizations of similar size and industry?
What's the average time from signing to first discounted purchase — their actual speed-to-savings?
How Una Measures Up
Put the checklist to work. Here's how Una answers the sections above.
Cost Structure
Membership is always free. No onboarding fees, no annual dues, no minimum purchase requirements. Una earns supplier admin fees and you pay nothing.
Category Fit
Horizontal GPO covering 2,500+ contracts across office supplies, shipping, food, JanSan, MRO, uniforms, travel, and more. Ask for the supplier list in your top categories.
Savings & Value
Free cost analysis benchmarked against your actual spend data before any commitment. Members save an average of 18–22% annually across indirect categories.
Support & Service
Dedicated Sourcing Advisor and Member Experience rep. Sourcing Advisors respond within one business day. Ongoing category identification and year-end spending reports included.
Flexibility & Control
No lock-in. No exclusivities. Direct supplier relationships throughout. Cancel at any time. Use as many or as few contracts as you choose.
Track Record
Behavioral health network: 27% average savings across categories within weeks. Meal program operator: 15%+ on food costs across 150+ chapters. Case studies available on request.
Ready to Put the Checklist to the Test?
Transparent fees, 2,500+ contracts, free cost analysis, no lock-in. See what Una can save you in your specific categories.