www.barebonespcb.com is good for this kind of thing too.
Only trouble is they electroless tin plate and don't reflow so shelf life
isn't great but this shouldn't be a problem for you since you're likely to
stuff right away.

To minimize your cost, panelize a couple of your designs together so you can
knock out a 'proto' PCB run for all that you're currently working on at
once.
Sometimes the price break in 'sq in' is such that you can incorporate
another board on the panel for essentially free (with PCBexpress anyways)

Dave

> If you are ultimately going to make "a large quantity" of these boards
> then you're almost foolish not to have a small handful of *real*
> prototype boards made from a real PCB vendor

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