Best Buy: Logitech Cordless Optical TrackMan Trackball Black/Gray 904369-0403
Logitech Trackman Cordless FX - Trackball - optical - wireless - USB / PS/2 wireless receiver - white, red - Walmart.com
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 Cordless Optical Trackman at TigerDirect.com