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)
Logitech Trackman Marble Trackball - Walmart.com
Amazon.com: Logitech Trackman Marble Trackball – Wired USB Ergonomic Mouse for Computers, with 4 Programmable Buttons, Dark Gray
Like New" Logitech Trackman Marble Trackball Mouse - computer parts - by owner - electronics sale - craigslist
Very Nice! Tested/Working! TrackMan Logitech MARBLE MOUSE USB optical trackball | eBay