Buy.com has the Kensington Orbit Optical Trackball USB w/ PS2 Adapter for $15.23 after a $10 rebate.

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The hand-hugging design provides the comfort and support of a mouse with the ease of use of a fingertip-controlled optical trackball. Compared to a conventional mouse, the stationary Orbit Optical Trackball requires less arm movement and saves desk space. The precise tracking mechanism is resistant to dust, reducing the need for regular trackball cleaning. Includes 6'' cord. Compatible with Windows 95 or later. USB and PS/2 connectivity for greater compatibility.

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