Lenovo offers its Lenovo N3902A Wireless Mouse in Red, model no. 57Y6673, for $29.99. Coupon code "USP1AG456673" cuts it to $11.99. With free shipping, that's $18 off and the lowest total price we could find, although it was $2 less three weeks ago. This mouse features a 1,000 dpi resolution and USB dongle. It requires two AAA batteries (not included).