Amazon.com: Genuine Dell K251D 6-Button Grey Gray Silver Black USB Scroll Wheel Optical Laser Mouse, Works Perfectly With Windows 95, 98, NT 4.0, 2000, XP, Vista, and Windows 7, and Will Work
J661D DELL MOUSE 6 BUTTON LASER MOUSE WITH USB CABLE - 6 BUTTON LEFT AND RIGHT CLICK PREVIOUS BUTTON NEXT BUTTON SCROLL WHEEL DPI SWITCH