Best Buy via eBay offers the Logitech M510 Cordless Optical Mouse in Light Silver, model no. 910-001822, for $17.99 with free shipping. That's $2 under our August mention and tied as the lowest total price we've seen. (It's a current low by $12.) This wireless mouse features a USB nano-receiver and ambidextrous, ergonomic design. Two AA batteries are included.