This place has very good prices, quality & fast shipping: 3pcb.com
I ordered a small batch of 30 7x8cm boards and they did a very good job. The boards were shipped in 3 days and the cost was about 40% less than Itead that I used before and no $150 minimums like OSH Park. They arrived shrink wrapped and packaged in a thick cardboard box and they included 3 extra boards. Highly recommended.
Saying: It's not famous as Seeedstudio, but the Elecrow PCB Service is much cheaper than seed's. and most important is that it provide SIX COLOR to CHOOSE FREE.
Their PCB service, Also Fusion PCB, The price of 10pcs double layer is almost the same as Seeed's, and they also provide 5pcs PCB service.
But when the PCB size is smaller than 10cm*10cm, 5pcs and 10pcs is the same price and I don't know why?
when the PCB size is bigger than 10cm*10cm, 5pcs PCB sevice will save amost US $10 per time.
Anyway, it depends on you which place is the most suitable for your project. I just hope this can help you can have more choices and make comparison before your decision.