A look at what is currently available on eBay
 Logitech Trackman Wheel USB Trackball Mouse T-BB18 free shipping US $60.97 
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 LOGITECH USB MARBLE TRACKBALL MOUSE T-BC21 810-000767 US $16.99
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 Trackball Touchpad Mouse USB Ergonomic Touchpad US $38.95
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 Logitech Marble Mouse USB Trackball Mouse US $9.99
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 Kensington Orbit USB Trackball Mouse US $9.99
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 Logitech Trackman Wheel USB Trackball Mouse US $31.00
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