Bestbuy offers Logitech - Marathon Mouse M705 Wireless Laser Mouse - Black for $19.99 (orig. $39.99) +Free Shipping

Product Description:
Logitech Marathon Mouse M705 Wireless Mouse: With a scroll wheel and stealth thumb guides, this mouse allows you to comfortably navigate features on your computer. An included Unifying USB receiver lets you wirelessly connect the mouse and up to 6 other devices (sold separately) to your PC or Mac.