B&H Photo-Vido offers the Targus Ultralife Wireless Mouse, model no. AMW065US, for $39.99 with free shipping. (Best Buy has it for the same price.) That's the lowest total price we could find by $7. It features a 1,200 dpi laser sensor, 2.4GHz wireless connectivity, wireless receiver / micro SD card reader, battery indicator, Windows and Mac compatibility, and more. It requires one AA battery (included).