Amazon.com: Logitech Trackman Marble Trackball Mouse - Wired USB Ergonomic Mouse for Computers, with 4 Programmable Buttons : Electronics
Amazon.com: Logitech TrackMan Marble FX Trackball : Electronics
Amazon.com: Logitech M570 Wireless Trackball Mouse – Ergonomic Design with Sculpted Right-Hand Shape, Compatible with Apple Mac / Microsoft, USB Unifying Receiver, Dark Gray (Discontinued by Manufacturer) : Electronics
Used - Very Good: Logitech TrackMan Wheel Silver Cordless Optical Mouse - Newegg.com