As one of its daily deals, AnkerDirect via Amazon offers Prime members the Anker Wireless Vertical Ergonomic Optical Mouse
with free shipping
. That's the lowest price we could find by $6. It features a sensitivity adjustment button (800, 1,200, or 1,600 DPI); next page and last page side-buttons; and is compatible with Windows, Mac, and Linux. Two AAA batteries are required (not included). Deal ends today.