Amazon offers the Logitech Anywhere Wireless Mouse MX in Black, model no. 910-001637, for $33.99 with free shipping. That's $1 under our March mention (which was a "dented box" item) and the lowest total price we could find now by $14. 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).