OSH Park (probably the most well-known such service) costs $10/square inch for a 4-layer board, for three copies of a board. As a ballpark figure, this board s

OSH Park (probably the most well-known such service) costs $10/square inch for a 4-layer board, for three copies of a board. As a ballpark figure, this board should be no larger than 1/5 square inch, so that's $2, for three boards. Agree on low volumes of the other components, although things like Seeed Studio's Open Parts Library (http://www.seeedstudio.com/depot/OPLopen-parts-library-catalog-c-136_138/?ref=side http://www.seeedstudio.com/depot/OPLopen-parts-library-catal...) is pretty nice for the very basics. Update: Didn't check if this board meets OSH Park's limitations.