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
ATPM 7.06 - Review: Turbo Mouse Pro
Kensington Mouse works 4-Button Mac/PC USB Mouse 72111 $35.99 | eBay