the cable to connect the drive I suspect is easier to find than the more powerful PSU you'll also want (with likely an accel, too). National Amiga in london, ontario made me one for a good price a few years ago but you have to send them your original PSU for the connector. Try contacting them about making you one, assuming they still do Amiga stuff. .
http://www.archtech.ca/catalog/kevin orme
amiga university
www.amigau.com
