Kensington Orbit Mouse - Wired Ergonomic TrackBall Mouse for PC, Mac and Windows with Scroll Ring, Ambidextrous Design and Optical Tracking - Blue (K72337EU): Amazon.co.uk: Computers & Accessories
Inspired by a post on here, MacGyvered a finger-operated trackball using an MX Ergo + cheap tablet stand : r/Trackballs
Cheap SeenDa Rechargeable Ergonomic Mouse 2.4G Wireless Trackball Mouse Easy Thumb Control Bluetooth Mice for PC Laptop Computer | Joom
Trackball bearings, a comparison of (cheap) rollers, BTU's and static bearings : r/ErgoMechKeyboards
Kensington Orbit TrackBall - Wired Ergonomic TrackBall Mouse for PC, Mac and Windows with Ambidextrous Design, Optical Tracking & 40 mm Ball – Space Grey (64327EU), Silver : Amazon.co.uk: Computers & Accessories
The Best Trackball Mice for 2024
ProtoArc EM03 Wireless Bluetooth Trackball Mouse Rechargeable Ergonomic RGB Backlit Rollerball Mice for Windows Mac iPad - AliExpress