Originally Posted by JonSick
As a mad idea, if I picked up a standard USB controller, would it be a big job to add the appropriate connector/cable and rewire it?
As I recall, there was quite a lot to this discussion either here or at amiga.org, it's not as straightforward as 'joining the wires'.
At Amigakit there are converters for old pc soundcard type gameports giving you a few options. You can get them on ebay but be really careful! I managed to get hold of a nes stick once
One reputable guy I know deals mainly in amiga stuff. His shop on ebay is called amiga retro experience and his name is airey36. I got a couple of cd32 pads from him