Logitech TrackMan Marble Wired trackball mouse, 300 DPI optical sensor Marble, USB port, for right or left-handed, PC / Mac - gray / red, English Packing: Amazon.de: Computer & Accessories
Amazon.com: Kensington Expert Wireless Trackball Mouse (K72359WW) Black, 3.5" x 6.1" x 8" : Everything Else