For future reference, post questions in the TECH SUPPORT thread rather than creating a new thread. Also, try searching and looking through the Tech Talk essentials thread, as I was able to find this stuff fairly quickly. Creating a thread should be the last resort. Anyways, back to the topic:
What system do you want a prewired PCB for? For the 360, go to Modchipman (select the wireless option if you want wireless) or check out the trading outlet. If you need one for the PS3, look at the Cthulhuthread for a wired PCB, the AXISadapterthread if you are interested in making a wireless joystick.