As one of its daily deals, Best Buy via eBay offers the Logitech M557 Bluetooth Mouse in Dark Grey, model no. 910-003971, for $21.99 with free shipping. That's the lowest price we could find by $7, although we saw it for a buck less in December. This wireless mouse features customizable buttons, vertical and horizontal scroll wheel, optical sensor, and ambidextrous design. Two AA batteries are included. Deal ends today.