I put several Atari 8-bit (and a few ATari ST) items on ebay.
View my ebay auctions here:
eBay Seller: chris82369
Some of the items include:
* Qix cartridge + Gauntlet II disk
* Atari 850 interface with original manuals
* AtarWriter cartridge + paperclip word processors
* Visicalc disks with original manual
* Atari 800XL power supply.
I also have a few Atari ST items: STM1 mouse, power supplies.