Ending today, Lenovo offers the Lenovo N6901 Bluetooth Laser Mouse, model no. 57Y6464, for $39.99. Coupon code "USP1FE416464" drops it to $13.99. With free shipping, that's a buck under our November mention and the lowest total price we could find by $13. Sales tax is added where applicable. Features include 1,000 dpi laser tracking, scroll wheel, and more. It requires two AA batteries.