i use www.pcbfabexpress.com (refer 'eoasap' if you use them please)
2 layer
5 board min @ $13/board
(ends up being $80 shipped to me, 5 day turn time)
7 mil trace & spacing
15 mil via's
unlimited drill sizes
soldermask, silkscreen included

www.pcbpool.com is one i was thinking of trying, but i dont like the huge shipping they charge.