Staples offers the Logitech Performance Mouse MX, model no. 910-001105, for $59.99. Coupon code "30441" drops it to $49.99. With free shipping, that's tied with last week's mention and the lowest total price we could find by $20. It features four thumb buttons, scroll wheel, and Logitech unifying receiver dongle that allows the addition of a compatible wireless keyboard without multiple USB receivers.