Logitech Mouse MX Ergo Vertical - USB, 2.4 GHz, black - Computer.is
Logitech MX ERGO Plus Wireless Trackball Mouse with Ergonomic design Graphite 910-005178 - Best Buy
Amazon.com: Logitech MX Ergo Wireless Trackball Mouse Adjustable Ergonomic Design, Control and Move Text/Images/Files Between 2 Windows and Apple Mac Computers (Bluetooth or USB), Rechargeable, Graphite - Black : Electronics