Lenovo offers its Lenovo N3902A Wireless Mouse in Black, model no. 57Y6574, for $34.99. Coupon code "USP1S426574" cuts it to $10.99. With free shipping, that's a buck under last month's mention of this mouse in a different color and the lowest total price we could find by $6. This mouse features 1,000 dpi and a nano USB dongle. It requires two AAA batteries (not included). Deal ends September 18.