I don't usually cruise through eBay in search of Commodore, but today, out of curiosity's sake I went there today in order to see what they have for PET parts. Amazingly, I found new picture tubes for a PET 2001 and PET 4032, and used power supplies for the PET 2001. However, the prices are quite steep. Just do a search for Commodore PET, and on the brief listing you will see these items.
Truly,
Robert Bernardo
Fresno Commodore User Group
http://videocam.net.au/fcug
July 25-26 CommVEx v5 - http://www.commodore.ca/forum and click on ComVEX