You can also get a CD32 to PC PSU adapter so you can use any old PC PSU to power the CD32 (and still power a PC at the same time if you want, if they're close enough).
You can get them really cheap from here -
http://www.amigamaniac.comI must add that these adapters use one of the spare CDROM/HDD power connectors in a PC PSU, and since the CD32 has its own power switch on the back, you could have it plugged into your PC all the time, and just switch the CD32 on when you want to use it. I guess you either need an extension cable or just to place the two next to each other on a desk to power them both at the same time.