Why This Checklist Exists
When I took over purchasing in 2020, I assumed the lowest quote was always the best choice. Three budget overruns later, I learned about total cost of ownership. This checklist is for anyone managing office supply buying—especially if you're new to the role or reporting to both operations and finance. It's a practical, step-by-step guide that covers the 5 things I do before placing any order. It's not a theory. It's what works.
Step 1: Define Your Actual Need (Not Your Guess)
This sounds obvious, but I can't tell you how many times I've ordered "500 packs of paper" only to find we already had 300 in storage. My rule now: check the inventory physically. I don't trust the spreadsheet. I walk the supply closet.
Checklist:
- What exactly do we need? (Product name, quantity, specs, preferred brand if any)
- Do we have any of it already? (Check physical inventory, not just the system)
- Who needs it? (One team, whole office, special project?)
- When do they need it? (Is there a hard deadline?)
I once ordered 50 custom notepads for the sales team. They needed them in 2 weeks. The 'cheap' vendor quoted 30 days. I had to pay for expedited shipping (which, honestly, felt excessive) and ended up spending 40% more than the 'slower' option would have cost. That's when I learned to always check lead times first.
Step 2: Vet 3 Vendors (But Not the Same Way Everyone Else Does)
Most people just get three quotes and pick the cheapest. I learned (the hard way) to check more than price. I look at these four things on a short list of three vendors:
- Pricing: Not just unit cost, but total cost (including shipping, handling, taxes, and any fees).
- Invoicing: Can they provide a proper, itemized invoice? This is a huge one. The vendor who couldn't provide proper invoicing cost us $2,400 in rejected expenses last year.
- Lead Times: What's their standard turnaround? What's their rush? Is it guaranteed? (The value of guaranteed turnaround isn't the speed—it's the certainty.)
- Return/Refund Policy: I read the fine print. (I should add that I always test a small order first with a new vendor.)
I also check their website for 'About Us' and contact info. If a vendor looks like a one-person operation with a generic email, I'm probably not going to use them for a large order.
Step 3: Run the Numbers (Total Cost, Not Just Unit Price)
This is where I make my finance team happy. I don't just compare the unit price. I build a simple spreadsheet with:
- Vendor A: $100 for 500 pens = $0.20 each (shipping $15) = $115 total
- Vendor B: $90 for 500 pens = $0.18 each (shipping $25) = $115 total
- Vendor C: $105 for 500 pens (free shipping) = $105 total
The lowest unit cost (Vendor B) actually came out the same as Vendor A when shipping was included. And Vendor C (with free shipping) was the true lowest. I only believed this after ignoring it once and eating a $800 mistake on a larger order.
Pro-tip: If you're buying regularly, ask about bulk or contract pricing. A vendor might give you a 10% discount if you commit to a quarterly order.
Step 4: Place the Order (And Document Everything)
Once I've decided, I place the order. But I don't just do it over the phone. I do it in writing (email or portal). This creates a paper trail. I include the vendor name, PO number (if applicable), date, and a clear list of everything ordered. I also save the confirmation email and the invoice when it arrives.
Oh, and I check the delivery. I can't tell you how many times I've received the wrong item or half an order. I open the box as soon as it arrives. If something's wrong, I get it sorted within 24 hours. Most vendors will fix it quickly if you catch it early. (Surprise, surprise: the budget option had quality issues. I had to reorder.)
I also keep a log of all orders: date, vendor, items, cost, delivery date. This has saved my bacon in audits and when I need to justify a vendor change to my VP. (Note to self: I really should automate this.)
Step 5: Follow Up and Learn (The 30-Day Check)
This is the step most people skip. Thirty days after the order, I do a quick check:
- Did the vendor deliver on time? (At least, that's been my experience with deadline-critical projects.)
- Was the quality as expected?
- Were there any issues (billing, returns, communication)?
- Would I use them again?
If I'm happy, I add them to my 'preferred' list. If not, I note why. Sometimes I leave a review on a platform (anonymously) if I think it will help others. I also update my internal notes so the next person (or my future self) doesn't make the same mistakes.
Common Mistakes to Avoid
After 5 years of managing these relationships, here are the biggest traps I've seen (and fallen into):
- Ignoring total cost. The lowest quote is rarely the lowest total cost.
- Not checking the return policy. You might get stuck with something you don't want.
- Relying on the cheapest vendor for everything. For standard items, it's fine. For custom or critical items, it's a risk.
- Not documenting the process. You'll forget the details. Your finance team will need the paper trail.
Honestly, I'm not sure why some vendors are so bad at invoicing. My best guess is that their focus is on fulfillment, not admin. But if they can't get a simple invoice right, what else are they getting wrong?
Pricing data is for general reference. Verify current rates with your selected vendors. (Prices as of Q1 2025; verify current pricing.)
