I use OSHPark for prototyping. I don't know where they send the boards, but they hit a reasonable compromise between cheap & fast: $5/sq inch for 3 boards. The quoting is immediate on their website. I usually have boards back in a week after ordering from OSH Park.

For production quantities, I use JLCPcb (China) with Airborne for shipping (so it doesn't take a month to get here). Their quality is very good. Pay the extra $20 and get a stencil to make paste application easy. It's worth it. I think my last order of 50 board roughly 2.5x3.5" with a metal stencil came to about $70 total with an additional $30 for 3-5 day shipping via Airborne.