As one of its daily deals, Amazon offers its Prime members the Logitech Wireless Performance Mouse MX, model no. 910-001105, for $44.99 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $8.74.) That's tied with our December mention as the lowest total price we've seen for a new unit. (It's a current best by $15.) It features four thumb buttons, a scroll wheel, and Logitech unifying USB receiver. Deal ends today.