CST L-Trac Red Trackball 2545-5W(GL) for sale online | eBay
Trackball Gets Bolt-On Button Upgrade | Hackaday
Amazon.com: X-keys L-Trac Black Trackball : Electronics
The CST 1400 - It's available for purchase and it's GORGEOUS! I'm thinking about if I'd be able to somehow put my scrollwheel on this... : r/Trackballs