Meritline offers the factory-refurbished Logitech Trackman Trackball Mouse, model no. 910-000806, for $19.99. Coupon code "MLCKB20QNL1" cuts it to $15.99. With free shipping, that's the lowest total price we could find for a refurb by $5. Features include ambidextrous trackball design, USB connectivity, fingertip-based control, and more. A 90-day Logitech warranty applies. Coupon expires after 100 uses.