Best Buy: Logitech Cordless Optical TrackMan Trackball Black/Gray 904369-0403
Best Buy: Logitech Cordless TrackMan Wheel 904346-0403
Logitech Cordless TrackMan FX Optical Mouse in Very-Good Condition | eBay
Logitech Cordless Optical Trackman Wireless Trackball Mouse Complete for sale online | eBay
A size comparison between the Logitech Cordless Trackman Optical, the Microsoft Trackball Optical, and the Elecom Huge, for if anyone is curious. : r/Trackballs