Best Buy offers the Logitech M705 Wireless Laser Mouse in Black, model no. 910-001935, for $19.99. Opt for in-store pickup to avoid the $5.49 shipping fee. That's the lowest price we could find by $7, although we saw it for a buck less in January. It features a nano-receiver, eight buttons, 1,000 dpi tracking, purports to have up to a 3-year battery life, and requires two AA batteries (included).