A look at what is currently available on eBay
 Logitech Wireless Ergonomic Trackball M570 Mouse US $41.55 
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 Logitech Marble Trackball Optical USB Mouse PC & MAC US $23.88
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 Logitech Marble Mouse USB Trackball Mouse US $9.99
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 Logitech Trackman Wheel USB Trackball Mouse US $31.00
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 LOGITECH USB TRACKMAN TRACKBALL ROLLER BALL/WHEEL THUMB MOUSE T-BB18 US $20.50
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 Logitech Wireless Trackball M570 Mouse New US $58.43
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 Logitech Trackman Trackball USB Mouse-Nice-No Reserve US $20.50
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 Logitech Trackball Mouse WIRELESS NEW**! US $24.00
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 Logitech Trackball / Rollerball / Marble Mouse with PS/3 Connector #804292 US $28.00
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 LOGITECH T-CL13 TRACKMAN MARBLE+ PS2 TRACKBALL SCROLL MOUSE US $15.50
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 NEW Logitech M570 Wireless Trackball Mouse w/ Mini USB US $46.68
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 Logitech Marble Mouse TrackMan Trackball New US $34.92
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Items recently purchased from this site
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USED VERY LOW HOURs, Logitech TrackMan Wireless Optical Trackball Mouse, Logitech M570 Wireless Trackball 910-001799 Comfy Mouse, LOGITECH TRACKMAN MARBLE TRACKBALL MOUSE PS/2 MODEL M/N # T-CH11 P/N 804122-1000, Logitech M570 Wireless Trackball Mouse 910-001799 NEW, Logitech Computer Trackman Trackball USB Marble Finger Mouse, NEW Logitech M570 Wireless Trackball Mouse w/ Mini USB, Set of 2 Trackball mouse-Logitech and Kensington usb cable connection,optical, LOGITECH TRACKMAN MARBLE TRACKBALL OPTICAL MOUSE PC,MAC, Logitech Wireless Ergonomic Trackball M570 Mouse, LOGITECH TRACKMAN MARBLE 4BTN USB/PS2 OPTICAL TRACKBALL MOUSE 910-000806, Logitech Wireless M570 Trackball Mouse, New Logitech Trackman Marble Trackball USB PC Mouse, LOGITECH T-BC21 MARBLE MOUSE USB Trackball Trackman, LOGITECH TRACKBALL MOUSE, LOGITECH USB MARBLE TRACKBALL MOUSE T-BC21 804377-0000, LOGITECH TRACKMAN OPTICAL MARBLE TRACKBALL MOUSE PC MAC RIGHT OR LEFT HANDED NEW, Logitech Trackman Marble Mouse Trackball T-BC21 USB, LOGITECH MOUSE TRACKMAN MARBLE AMBIDEXTROUS TRACKBALL, Logitech Trackman Marble PC or Mac Trackball Mouse NEW, LOGITECH M570 WIRELESS TRACK BALL TRACKBALL mouse w/usb excellent condition, Logitech Marble Mouse TrackMan Trackball New, *NEW* Logitech Marble Mouse Wired USB PC MAC Trackball PN 910-000816, LOGITECH TRACKMAN MARBLE TRACKBALL MOUSE FOR RIGHT & LEFT HANDED ERGONOMIC NEW, Logitech Trackman Marble Mouse Trackball 910-000806, Logitech Trackman Marble Mouse PC or MAC Trackball NEW!, Logitech Trackman Marble Mouse Trackball NEW, Logitech Trackman Wheel USB Trackball Mouse, Logitech Trackman Marble Ambidextrous Trackball Mouse 910-000806 left right hand, Logitech Marble Trackball Optical USB Mouse PC & MAC, LOGITECH T-BC21MARBLE MOUSE Trackball Trackman USB, Brand New Logitech Trackman Marble Trackball Optical Mouse for PC/Mac,904360-040, Logitech Trackman Marble Mouse PC MAC Trackball , Logitech Trackman Marble Ambidextrous Trackball Mouse 910-000806, Logitech T-CH11 TRACKMAN MARBLE TRACKBALL MOUSE (SERIAL PS/2 PORT), Logitech Marble Mouse USB T-BC21 804377-0000 Trackball Track Ball Mouse, Logitech Marble Mouse Trackman Trackball USB, Logitech Trackman Marble Ambidextrous Trackball Mouse - 910/000806, Logitech Trackball Mouse WIRELESS NEW**! , Logitech USB T-BC21 804377-0000 Marble Mouse Trackball Track Ball Mouse FREESHIP, Logitech TrackMan Vista PS/2 T-CG10 ( trackball mouse ), Logitech Model T-CG10 Trackman Vista PS/2 Trackball Mouse White Used, Logitech Trackman Marble PS/2 Trackball T-CH11 3 Button Mouse Track Ball, Logitech Trackball Marble Mouse, NEW LOGITECH BALL for TrackMan Wheel Trackball Mouse T-BB18, Logitech Model T-CC2-9F Trackball Stationary Serial Mouse Used, LOT OF 10 ORIGINAL Dell 0X7636 Logitech M-UK DEL3 USB Mouse Trackball, Logitech Cordless Optical TrackMan - Wireless Trackball Mouse, Logitech Trackman Trackball USB Mouse-Nice-No Reserve, 4 BUTTON LOGITECH MOUSE (WITH NEW RED LOGITECH TRACKBALL), LOGITECH USB MARBLE TRACKBALL MOUSE T-BC21 810-000767, Logitech Marble Mouse USB Trackball- used,