I just put in my first order at this place:
http://dorkbotpdx.org/wiki/pcb_order
They are supposed to come back from the fabricator in about a week. Pretty good deal considering the fast turnaround and tight board specs. It is also nice that I can just send them my eagle board file and they will take care of creating the gerber files from it. Cost me about $14 for 3 double sided boards.