eXpansys offers the iMicro 3-Button Wireless 3D Optical Scroll Mouse in Black, model no. MO-16SBK, for $8.99 with free shipping. That's $2 under our August mention and the lowest total price we could find by $4. This 800 dpi mouse features three buttons, ambidextrous design, and optional USB cable. It uses two AAA batteries (not included).