Kensington PilotMouse Optical Mouse - 72127 $17.99

The PilotMouse Optical features a refined shape and flexible rubber grips -- providing an entirely new level of comfort and control. The speed and pinpoint accuracy of Kensington's unique DiamondEye optical technology respond to even your fastest movements. And it works right out of the box -- guaranteed.

Buy.com is carrying this Optical Mouse for $17.99