Nice Used Working Logitech Trackman Marble Ball Mouse - Windows 95 / 98 PS2 4164 | eBay
Amazon.com: Logitech Marble Mouse : Electronics
Hey Logitech, as a decades trackball user for everything, including gaming @ 1000hz on the marble, with custom 1000hz driver that doesn't run past many game's anticheats, I've been waiting for this