For in-store pickup only, Best Buy offers the Logitech M525 Wireless Optical Mouse in Black, model no. 910-002696, for $19.99. That's $4 under the lowest shipped price we could find. (We saw one for $10 less in November, but it required rebate hassles.) This wireless mouse features a unifying receiver, micro-precision scroll wheel, and an ergonomic design. It requires two AA batteries, included.