Staples offers the Logitech T620 Touch Cordless Optical Mouse in Black, model no. 910-003334, for $19.99. Plus, Staples Rewards members qualify for free shipping. (Not a member? Click here to sign up for free.) That's $10 under our mention from two weeks ago and the lowest total price we could find by $23. This wireless mouse features a full touch surface, unifying receiver, and more. It requires two AA batteries (included).