Lenovo offers its Lenovo N3903A Wireless Mouse in Metal, model no. 57Y6596, for $39.99. Coupon code "USP1JN456596" cuts it to $9.99. With free shipping, that's $2 under our July mention and the lowest total price we could find by $6. This mouse features a 1,000 dpi resolution and USB transmitter and includes two AAA batteries.