Logitech Trackman Marble Mouse, Four-Button, Programmable, Dark Gray - Newegg.com
Logitech Trackman Marble Trackball Mouse – Wired USB Ergonomic Mouse for Computers, with 4 Programmable Buttons, Dark Gray, Computers & Tech, Parts & Accessories, Computer Keyboard on Carousell
The 3 Best Trackballs for 2022 | Reviews by Wirecutter