$24
From website:
This hand-friendly wireless trackball lets you work and play wherever you want. No mouse to move around. No tricky keypad leaving your hand feeling cramped. Just roll the ball with your thumb and click. Precision never felt so comfortable. Thumb-operated trackball and laser sensor for smooth, precise cursor control. Works anywhere you do—even your sofa. Powerful 30 ft. wireless range with tiny leave-in Logitech Unifying receiver. It has up to 18 months of power on a single AA battery. Scroll wheel and Back/Forward buttons for easy document and web page navigation. Enhanced comfort—refines the time-tested shape of the popular Logitech Trackman Wheel.
It works great, but I no longer need it.
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