For simpler prototype boards I use oshpark.com, but a big downside is no electrical testing. For more important/complex stuff, I've been very happy with jetpcb.

For simpler prototype boards I use oshpark.com, but a big downside is no electrical testing. For more important/complex stuff, I've been very happy with jetpcb.com in Taiwan. Full e-test and I get the boards in about 5 days