NEW Blackberry Trackball Breakout Board Module 2.5V~5.25V | eBay
Billiard Ball Finds A New Home In Custom Trackball Mouse | Hackaday
Blackberry Trackballer Breakout
2 Inch Mini Trackball - With USB OR 60-In-1 Connection - Arcade World UK
SparkFun Blackberry Trackballer Breakout , from Sparkfun for €20.12
Grove - Mini Track Ball | Seeed Studio Wiki
pimoroni on Twitter: "NEW PRODUCT! Trackball Breakout. An RGBW-illuminated, clickable, mini trackball, just like the one in your favourite fruit-flavoured phone. Use it to add navigation, control, and interaction to your projects.