Lenovo offers the Lenovo N6901 Bluetooth Laser Mouse, model no. 57Y6464, for $39.99. Coupon code "USP1JU446464" drops it to $11.99. With free shipping, that's tied with our March mention as the lowest total price we've seen. (It's a current price low by $35.) Features include a 1,000 dpi sensitivity and laser tracking. It requires two AA batteries. Coupon expires June 26.

Note that this doesn't come with a USB dongle.