Wow thanks for the link. I like the fact that it's not per-board it's per-area. Sure, sometimes you may only want one or two boards but who couldn't use extras for a decent price? If you've got a 3x4" board they'll make you 8 of them for $100? Including shipping? That's fantastic. Love it.
Ah - the catch is no testing on 2 layer boards with a 15% fail rate. 4 layer and higher they test and have a 2% fail rate. Still, using the example above you'd have 1-2 boards fail per batch. Even with 2 failed boards you're talking about ~$18 per board. Not bad at all.
I've found seeedstudio http://www.seeedstud....html?cPath=185 to be cheapest for small prototyping even with the import duty & delivery costs. $35 for 10 boards of a max size of 10cm by 10cm.