Kensington Wireless Orbit Mouse for $40 + free shipping
Buy.com offers the Kensington Wireless Orbit Mouse, model no. K72352US, for $39.99. (Amazon has it for the same price.) With free shipping, that's the lowest total price we could find by $1. It features 2.4Ghz wireless connectivity, USB dongle, touch scrolling, and two AA batteries.
2 very similar deals were also reported by some other sources:
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