Logitech MX ERGO PLUS Advanced Wireless Trackball Mouse Black 910 005178 - Office Depot
Still using this old Logitech Trackman Marble FX. I never found a more comfortable new trackball to replace it with. : r/Trackballs
Logitech ERGO M575 Wireless Trackball Mouse - Easy thumb control, precision and smooth tracking, ergonomic comfort design, for Windows, PC and Mac with Bluetooth and USB capabilities - Graphite - Newegg.com