Wanted: Saturn USB Pad for PC

I'm after a Saturn USB pad for the PC. It can be the official Sega released one seen here:
http://www.ncsxshop.com/cgi-bin/shop/CS2-0004.html

or a hacked one like seen here:
http://www.gamesx.com/controldata/usbsatpad/

or if anyone knows a good place to buy one of these, that would be cool too.