Why a Qualified Part Changes Price Between Orders

September 24, 2026

The second order costs more than the first and nobody can say why. Before assuming the shop is opportunistic, it is worth knowing which causes are real, because most of them are and several are inside your control.

The legitimate causes

Material moved. Aluminum and stainless prices are not stable, and a shop that quoted from stock last quarter may be buying at a new price now. Ask to see the material line.

The lot got smaller. Setup spreads over fewer pieces. Ordering forty as four lots of ten costs more than ordering forty once, every time.

The finisher requoted. Anodize and electropolish suppliers change their own prices and batch minimums. A finisher that dropped a small batch option can move a small order significantly.

The schedule got shorter. An expedite is a real cost, whether it buys queue position at the shop or a dedicated batch at the finisher.

Inspection scope grew. A report per piece added at some point in the relationship, often verbally and never removed.

Exchange rate and freight. For export orders these move the landed number without anyone touching the part.

The causes that are actually yours

A quiet drawing revision. The most common one. A hole moved, a finish note changed, a marking requirement added. Every revision after programming restarts part of the setup, described in what drives the cost of a semiconductor test jig.

An unstated repeat schedule. A shop that does not know the part returns quarterly prices each order as a one off, because that is what it looks like.

Scope creep in the paperwork. Certificates, reports and packing levels added one at a time, each small, none priced.

The ones that deserve a conversation

A rise with no named cause. A unit price that moves while the quantity and drawing are identical. Setup charged again on a part whose fixture and program already exist and have not changed. None of these is automatically bad faith, and all of them are fair to ask about directly.

How to hold a price steady

Freeze the drawing and treat any change as a new quote, deliberately
State the repeat schedule, even approximately, so the shop can plan material and capacity
Order spares with the original, when setup is already paid, as covered in spares and consumable hardware planning
Ask for a price valid for a stated period against a volume commitment
Keep inspection scope written down, so nothing is added by habit
Ask for the quote in lines, so a change shows up in the line it came from, following reading a machining quote line by line

What a good shop does

It tells you the cause before you ask, quotes the alternative if there is one, and offers the option that costs less: a larger lot, a longer window, a standard finish. A shop that raises a price and explains the driver is behaving normally. A shop that raises a price and cannot locate it in its own cost sheet has a problem you will meet again.

If a repeat price has moved and you want a second read on whether it is reasonable, send the RFQ with the drawing and the current quote and we will put it in front of shops that quote the same work.

Frequently asked questions

Is a price rise on a repeat part a bad sign?

Not by itself. Material and finishing prices move, and a smaller lot carries more setup per piece. What matters is whether the shop can name the cause. A rise nobody can explain is the warning, not the rise itself.

Can we fix a price for a year?

Often yes, in exchange for a volume commitment or a stated schedule. Shops price certainty generously because it lets them plan capacity and buy material better.

What is the most common hidden cause?

A quiet drawing revision. A moved hole, a changed finish note or an added report restarts part of the setup and the price reflects work the buyer does not remember requesting.

Need a quote for this part?

Send the drawing. We match you with up to 3 shops in Vietnam and reply within 24 business hours.

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