Buy.com has a Kensington Orbit Optical Trackball for $17.99 after $5 rebate with Free Shipping on orders over $25.
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- Control your cursor with a simple touch of the finger! The highly accurate Orbit Optical is as easy to use as a regular mouse, but it stays in one place saving you valuable desk space. The precise optical tracking mechanism is also resistant to dust, reducing the need for regular trackball cleaning