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
Kensington's new SlimBlade Pro trackball mouse lets you hook it up wirelessly - The Verge
Kensington Expert Mouse® Wireless Trackball with Bluetooth®
Vintage Kensington Orbit Track Ball USB Mouse 64226 Blue Ball - WORKING | eBay
Amazon.com: Kensington Orbit Wireless Trackball with Scroll Ring, Professional Computer Mouse with Bluetooth, (2.4GHz Wireless), Optical Tracking & AES Encryption Security, Left or Right Handed - Black (K70992WW) : Electronics
Kensington Orbit 72337 Optical Gaming Ambidextrous Mouse with Scroll Ring Black and Blue K72337US - Best Buy