Just got this beauty for my Win98 machine: Logitech Marble Mouse (PS/2) : r/Trackballs
Logitech Trackman Marble Mouse, Four-Button, Programmable, Dark Gray - Newegg.com
Amazon.com: Logitech Trackman Marble Trackball – Wired USB Ergonomic Mouse for Computers, with 4 Programmable Buttons, Dark Gray : Electronics
Logitech Marble Mouse Corded Trackball PS2 Port Connector White with Red Ball | eBay
Logitech Trackman Marble
Logitech M570 2.4g Wireless Gaming Mouse Optical Trackball Ergonomic Mouse Gamer For Windows 10/8/7 Mac Os Support Official Test - Buy Gaming Mouse,2.4g Wireless Optical Mouse,Optical Ergonomic Trackball Mouse Product on Alibaba.com
Logitech Trackman Marble: So Close to Perfect - YouTube
high sierra - Is there still some way to get scroll wheel functionality on the Marble Mouse with macOS today? - Ask Different
TrackMan Marble by Logitech : ErgoCanada - Detailed Specification Page