Most fab houses have a minimum order of 5 copies of each board (and increments of 5). OSH Park has minimum of 3, but at a much higher price than some of the others.
More info, including how to check prices:
An introduction to getting printed circuit boards (or PCB-type front panels) fabricated.
First someone needs to design the PCB. Let’s assume that’s done already. Then they have to produce the files known as Gerbers that describe the PCB for the fabricator (and the drill files, usually included with the Gerbers though technically they’re not Gerbers). Let’s assume that’s done already too. You’ve found a repository that has Gerbers for a PCB you want; what do you do?
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