Microsoft Optical Trackball
A look at what is currently available on eBay
 Microsoft Trackball Optical 1.0 PS2 USB Mouse - Missing Ball US $10.50 
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 Microsoft Trackball Optical 1.0 X05-87475 US $71.99
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 Microsoft Trackball Optical 1.0 PS2 USB Mouse X05-87475 US $115.00
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 Microsoft Trackball Explorer 1.0 Optical USB Mouse US $119.99
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 MICROSOFT TRACKBALL OPTICAL 1.0 Mouse USB (USED) US $55.00
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Definition of Trackball?
I have a bet with my roommate that a trackball is not a mouse. I pointed him to the definition of mouse at dictionary.com and argued that a mouse has to be moved, but a trackball is stationary and only the ball moves. He countered with that fact that the product page for the Microsoft Trackball it refers to it as the Trackball Optical Mouse. Which one of us is right?
i learned that trackball and mouse is a different thing but have same the way it use. track ball is like "deodorant" ball (you know that)..you must use your hand to move the ball for the sensor..it's like a computer mouse that you upside down it and move the ball using your hand but the position of the mouse did not changing (did not need space)..while mouse is a device that we must move it (need space) a lot in any direction..QQ