Newegg has the Logitech Anywhere Mouse MX Wireless Laser Mouse for $50 - $10 off with coupon code EMCKAHH63
[Exp 9/28] = $40
with free shipping. Features the Logitech Darkfield Laser Tracking technology which claims to work on glass and uneven surfaces. Includes Logitech Unifying receiver, 2 AA batteries, and carrying pouch.