I have two parallel printer interfaces for Commodores that I'm selling, seeing as I mostly just use my C64/128 for games and demos. However, if anyone has need to print from a Commodore or wants a PC standard parallel interface on their Commodore for some weird homebrew electronics projects, here's your chance. These work on C64 or C128 (in either mode) and I think also will work on VIC-20s.
Cardco Super-G parallel printer interface:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=260097279917
Xetec Super Graphics Jr. parallel printer interface with box and manual:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=260097283349