TigerDirect via eBay offers the Logitech M310 Cordless Optical Mouse in Black, model no. 910-001922, for $14.99. With free shipping, that's the lowest total price we could find by $5. (We saw two Logitech M310 mice for $22 shipped in November, since expired). This 2.4GHz wireless mouse features a nano receiver, 12-month battery life, and more.