A size comparison between the Logitech Cordless Trackman Optical, the Microsoft Trackball Optical, and the Elecom Huge, for if anyone is curious. : r/Trackballs
Logitech ERGO M575 Wireless Trackball with Smooth Tracking
Logitech Trackman Wheel T-rb22 Wireless Trackball Mouse Ps2 USB Optical Cordless for sale online | eBay