Trackman Vista Trackball
A look at what is currently available on eBay
 LOGITECH T-CG10 TrackMan Vista PS/2 Trackball 3-Button Mouse for PC US $11.50 
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Logitech TrackMan Vista PS/2 T-CG10 ( trackball mouse ), Logitech Model T-CG10 Trackman Vista PS/2 Trackball Mouse White Used, Logitech Trackman Vista CG10 Trackball Mouse USB/PS2, LOGITECH T-CG10 TrackMan Vista PS/2 Trackball 3-Button Mouse for PC,