Does anyone know a good cheap easy online service for building 2-sided flex printed circuit boards?

these are what I found so far:

http://www.speedypcb.com/

http://www.flexiblecircuitry.com/...

http://www.4pcb.com/


I like ExpressPCB or PCBExpress---but neither do flexible pcbs.

Answer:
I've used Advanced Circuits before (4pcb.com, your third choice). I was very happy with the results and found their rates to be competitive (I've designed a number of sophisticated 4 layer boards in my career).

If you ask to have your boards made as prototypes, you can get a cheaper rate. I believe they also do flex boards, but don't know how their prices compare with others when it comes to flex boards.

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