Staples offers the Logitech Performance Mouse MX, model no. 910-001105, for $59.99. Coupon code "43779" drops it to $49.99. With free shipping, that's tied with our mention from last fall and the lowest total price we could find now by $26. 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.