Cheap prototype PCB boards?

I make board form "pcbasample.com":http://www.pcbasample.com many times,its ok for me cause I only made 10pcs each time ,quality ok,but only up to 6 layers ability

Depends on the size of the boards you are needing...for smaller/medium boards I use "BasicPCB(BasicPCB)":http://www.basicpcb.com/ (USA) which turns out to be one of the cheapest and fastest i have found.

for larger size boards i use "Advanced Circuits(Advanced Circuits)":http://www.4pcb.com/pcb-prototype-2-4-layer-boards-specials.html (USA) $33 special which you can order any size as long as it fits in their 60 square in maximum restriction...you are able to do your own array with this deal so if you have multiple pieces that will fit in their 60 square inches it may turn out to be a better deal.

 Recently, i found a company called jlcpcb. It’s very cheap10pcs boards. 1.2mm thick, 1-OZ copper, 6/6-mil outer (0.1525mm) just cost $2Cheap price and lots of options regarding board thickness, colour, etc. None of my boards have ever had a manufacturing issue. I think there are no difference with i bought from others.Shipping time (dhl)lasts 3 days.  Check it  https://jlcpcb.com/

Hello everyone, We are focusing on online PCB prototype and assembly manufacturers, we have our own factory, our website can quote and order online, and now we have a $ 3.99 promotion that can be enjoyed within certain conditions. Our website is https://www.wellpcb.com/. My Skype is service03_30.If there are any problems about PCB can contact me at any time.