Logitech Optical Gaming Mouse G400 with High-Precision 3600 DPI Optical Engine (910-002277) for $34.30

3600 dpi optical engine: Get precision targeting, pinpoint accuracy and consistent response at any hand speed. In-game sensitivity switching: Four dpi levels let you instantly go from pixel-precise targeting to lightening-fast maneuvers. 1 millisecond report rate over USB: Mouse movements are communicated to your PC at a blazing-fast 1000 reports per second. Built for battle: Comfortable sculpted grip, low-friction feet and rugged long-life buttons that withstand demanding play. Made for PC gaming: Compatible with Windows XP, Vista and 7