I'm starting to reduce my collection of pointing devices, I'll be slowly adding more stuff.
Microsoft Trackball Optical: arguably the largest, most comfortable thumb-operated trackball, mint condition, original packaging.
Logitech Cordless Optical TrackMan (T-RB22) w/ Logitech Cordless Mouse Receiver: popular large right-handed trackball, 44mm ball supposedly compatible with respective Elecom, used, rubber coating has aged badly, I've only briefly tested it as personally I hate the shape.
Logitech TrackMan Wheel (T-BB18): mid-sized thumb-operated trackball, USB w/ PS/2 support, NIB.
2× Logitech Cordless TrackMan Wheel (T-RA18) w/ Logitech Cordless Mouse Receiver: mid-sized thumb-operated trackball, wireless version, mint condition, original packaging.
Elecom DEFT (wired, fancy packaging): modern right-handed trackball, NIB, wired version with fancy packaging.
Kensington Orbit Elite (USB): mid-sized ambidextrous trackball, mint condition, original packaging.
Logitech TrackMan Marble (T-BC21): mid-sized ambidextrous trackball, USB, lightly used, original packaging.
Logitech TrackMan Marble Wheel (T-BB13): mid-sized thumb-operated trackball, USB w/ PS/2 support, used.
Digit 2700: mid-sized/large ambidextrous trackball, three buttons w/ drag&drop lock, backlit ball, serial, used.
Zalman FPS Gun: gaming vertical mouse w/ unusual shape, 6 buttons&wheel, 2000 dpi etc., unused, as new, original packaging.
Cherry F-8900: a large ambidextrous, wireless mouse from Cherry, unused, as new, original packaging.
Shipping from the Czech Republic. Insured package costs usually €10-25 depending on country/weight.