It looks like OSH Park would cost $34 for 3 boards, more if they round up, iTead is < $25 for 10 boards. Often of course for the first run you only need 3 boards, and likewise for the first run who cares about $9.
I admit it's a nice feature to accept the original design file rather then Gerbers, that's actually one reason I use iTead because they will take an Altium file, and I will use 10 boards because it's a networked project and each person testing needs at least 2 probably 3.
Rob