Amazon.com: Kensington Pro Fit Ergo Vertical Wired Trackball (K75256WW) : Everything Else
Kensington Expert Mouse Optical Trackball
Amazon.com: Kensington Orbit Mouse - Wired Ergonomic TrackBall Mouse for PC, Mac and Windows with Scroll Ring, Ambidextrous Design and Optical Tracking - Blue (K72337EU) : Electronics
Amazon.com: Kensington Orbit Trackball Mouse with Scroll Ring (White) (K72500WW) : Electronics
Daily driver for the last 2 years: plain old Kensington Expert. Even though I had used virtually every other trackball out there. : r/Trackballs