Buy.com offers the Logitech Wireless Anywhere MX Wireless Laser Mouse, model no. 910-000872, for $39.99. (Amazon has it for the same price.) With free shipping, that's the lowest total price we could find by $6, although we saw it for $20 less after rebate in January. It features laser tracking, scroll wheel, thumb buttons, 2.4Ghz wireless connectivity, micro USB dongle, carrying pouch, and two AA batteries.