Amazon again offers the Logitech Wireless Laser Anywhere Mouse MX in Matte Black, model no. 910-000872, for $34.99 with free shipping. That's tied with a brief mention from yesterday and the lowest total price we could find by $10, although we saw it in another color for a buck less last spring. It's compatible with both Windows and Mac, and features laser tracking, scroll wheel, thumb buttons, 2.4Ghz wireless connectivity, micro USB dongle, and carrying pouch. It requires two AA batteries (included).