Lenovo offers its Lenovo N3903A Wireless Mouse in Coffee, model no. 57Y6666, for $29.99. Coupon code "USP1D436666" cuts it to $10.49. With free shipping, that's the lowest total price we could find by $6, although we saw it in August for a buck less. This mouse features a 1,000 dpi resolution and USB transmitter and includes two AAA batteries.