Why I Stopped Believing in Low Unit Prices — and What I Use Instead

I used to think unit price was the only number that mattered

Let me be blunt: for the first few years of managing procurement for metal stamping and CNC parts, I chased the lowest per-unit price like it was my job. I’d get three quotes, pick the cheapest, pat myself on the back.

Then came the order that changed everything.

It was Q1 2023. I was sourcing a batch of stamped brackets for a new automotive enclosure assembly. Vendor A quoted $4.70/unit. Vendor B quoted $6.05/unit. Vendor A also offered “free setup” for first-time customers — a red flag I should have recognized sooner. I went with Vendor A. Total order value: roughly $18,800.

Eight weeks later, after three rounds of rework, missed delivery windows, and a $3,400 rush shipping bill to meet the customer’s deadline, the real cost landed at $26,100. Vendor A’s unit price ended up costing us $6.53/unit — more than Vendor B’s original quote. Add the stress (and the angry email from our production manager) and it wasn’t even close.

That’s when I stopped believing in unit price. I started using something else.

Total cost of ownership (TCO) — the framework I now use

If you’re sourcing automotive stamping parts, forging components, or aluminum extrusions, you’ve probably seen the same pattern. A quote looks cheap until you factor in everything else:

• Setup and tooling fees — sometimes buried, sometimes “waived” but recovered elsewhere
• Revision charges — first revision might be free, but the second one isn’t
• Quality rework costs — if the parts don’t meet spec, who pays for the redo?
• Delivery expedite fees — when a supplier misses a deadline, you pay to make up time
• Inventory carrying cost — longer lead times force you to hold more safety stock
• Hidden compliance requirements — some suppliers include basic testing, others charge separately

Here’s the spreadsheet I built after that incident (note to self: should have done this years ago). It’s not complicated. Just six line items:

Total Cost = (Unit Price × Quantity) + Setup + Rework + Shipping + Quality Escapes + Admin Time

I plug in the numbers for every vendor I’m evaluating. The difference is often 15–20%, sometimes more. The lowest unit price rarely wins.

Take a recent example from Q2 2024. We needed progressive die stampings for a new engine mount bracket. Three suppliers. Vendor X quoted $3.20/unit, Vendor Y $3.85/unit, Vendor Z $4.10/unit. By TCO, Vendor Z was actually $0.58/unit cheaper because their tooling was included, they offered first-article inspection at no charge, and their lead time was 3 weeks instead of 6.

Why “cheap” suppliers often cost more

I think there are structural reasons low-price suppliers end up being more expensive overall, but I’ll admit I’m not 100% sure. My best guess is they optimize for front-end pricing — the number you see on the quote — and cut corners on process control, quality inspection, and shipping reliability. When a supplier doesn’t have in-house die making capability or integrated CNC finishing, they subcontract. Subcontracting adds handoffs, delays, and quality variability.

This is where beru, for example, stands out in my experience. When I evaluate suppliers, I look for multi-process integration — if a supplier can do stamping, die making, CNC machining, and finishing in one facility…

I’ve seen the same with beru ignition coils, stator alternator components, and water pump thermostat housings — the suppliers that control more of the value chain tend to have fewer hidden costs.

I don’t know why this isn’t more common. Maybe buyers are conditioned to focus on upfront price. Maybe procurement software makes it easy to sort by unit price. But after tracking roughly 200 orders over 7 years, I can tell you: the correlation between low unit price and low TCO is weak at best.

But what about budget constraints?

I hear this objection a lot: “We have a hard ceiling on unit cost. We can’t pay $6.05 when the budget says $4.50.” I get it. I’ve been there.

Here’s what I’ve learned: when I present TCO analysis to our finance team, they usually approve higher per-unit costs if I can show lower total spend. Because total spend is what actually hits the P&L. Unit cost is just one line item. If I pay $1.00 more per unit but save $15,000 in rework and expedite fees, the CFO doesn’t care about the unit price. They care about the $15,000.

It took me two failed budget cycles to figure that out. My experience is based on roughly 200 orders, mostly mid-range quantities (500 to 5,000 parts). If you’re sourcing in very high volumes or very small runs, your experience might differ. But the TCO principle holds.

So if my thermostat analogy feels forced…

Honestly, maybe the right thermostat setting really is 68°F when you’re home. But in procurement, the “right setting” is almost never the cheapest unit price. It’s the one that gives you the lowest total cost — including time, risk, and quality.

And frankly, I think that’s a lesson worth sharing.