I have used this company for a personal project. They're the best prices I've found for making PCBs (though you have to wait for the shipping from China). I can bring in some of the results.
http://www.goldphoenixpcb.com/singlepag ... ecialprice
I ended up added extras to bring it from $110 to $150, but you can get 155 sq inches of PCB for $110. It's hard to beat $1.5 / sq inch
If there is a group project to make many boards or possibly even combining different projects into a single run this could be a good resource for PCBs.