Lenovo offers its Lenovo N70A Wireless Laser Mouse in Dark Gray, model no. 0B44660, for $39.99. Coupon code "USP1OC244660" cuts it to $8.99. With free shipping, that's the lowest total price we could find by $25 and the best deal we've seen. It features a rotating design, 1,200 dpi resolution, nano USB dongle, and up to six months of battery life.