Best Buy via eBay offers the HP x3000 Wireless Optical Mouse in Black, model no. H2C22AA#ABL, for $7.99 with free shipping. That's tied with our mention from a month ago as the lowest total price we've seen. (It's also a current low by $2.) This 3-button mouse features an ambidextrous design and includes a wireless USB nano receiver. It requires one AA battery (included).