Staples offers the Logitech Wireless Performance Mouse MX, model no. 910-001105, for $49.99. Plus, Staples Rewards members bag free shipping. (Not a member? It's free to sign up.) That's the lowest total price we could find by $11, although we saw it for $2 less in April. 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. Deal ends June 20.