Trackball Mouse Spaceball
A look at what is currently available on eBay
 SPACETEC SPACEBALL 4000-FLX 3D TRACKBALL SERIAL MOUSE US $235.00 
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 SPACETEC SPACEBALL 4000-FLX 4000FLX 3D TRACKBALL MOUSE US $210.00
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 IBM 4000 FLX A Spaceball Trackball Mouse !! US $45.50
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Items recently purchased from this site
SPACETEC SPACEBALL 4000-FLX 3D TRACKBALL SERIAL MOUSE, SPACETEC SPACEBALL 4000-FLX 4000FLX 3D TRACKBALL MOUSE, SPACEBALL 4000 FLX TRACKBALL 12 BUTTON SERIAL MOUSE , SPACEBALL 4000 FLX TRACKBALL 12 BUTTON SERIAL MOUSE w/ side connection, SPACEBALL 4000 FLX TRACKBALL 12 BUTTON SERIAL MOUSE BLACK, IBM 4000 FLX A Spaceball Trackball Mouse !!,