A look at what is currently available on eBay
 2.4G USB Wireless Trackball Handheld Optical Mice Mouse US $26.66 
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 Portable Mini Finger Handheld USB Trackball Mouse Mice US $12.99
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 Finger Hand Held 4D USB Mini Trackball Computer Mouse US $12.06
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 Wireless Finger HandHeld USB Mouse Mice Trackball Mouse US $27.70
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 Dolphin 3D Mouse Trackball Handheld USB Wire for PC US $1.99
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 2.4G Optical USB Handheld Wireless Trackball Mice Mouse US $28.49
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 Finger USB Handheld Optical Trackball Mouse For PC US $5.32
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 Handheld USB Mouse Trackball 4 Notebook PC Outdoor NEW US $6.92
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 NEW Finger Hand Held 4D Usb Mini Trackball Mouse Mice US $14.99
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