I get a lot of stuff from DipMicro. Shipping is pretty cheap, depending on weight but the most it's cost me is $3 for a few hundred components for first class and it came in two days, given that their warehouse is only about 30 miles away. But their prices are very reasonable, and get cheaper as the quantity ordered goes up. Here's a link to one of the protoboards they sell out of a few FR1 (Heliotype/Bakelite) Prototyping PCB 70 x 50mm w/ 432 Pads - dipmicro electronics . Check them out, can't hurt about $37 for 100 of 70x50mm I think.