I'd like to try running older Windows versions in Parallels 5. Only problem: I don't currently have suitable install discs for anything older than Windows XP. I'm not looking for the REALLY old pre-Windows 95 versions, just the stuff from 95 to 2000 (i.e. 95, 98SE, ME, NT3 or NT4, and 2000). What's the best way to get a hold of these? eBay? Amazon? Others?