Meritline offers the Genius Optical Wireless Mini Navigator Mouse in Black, model no. 31030533107, bundled with a mousepad for $12.99. Coupon code "MLC6X1Y4ZNL1" cuts it to $7.99. With free shipping, that's the lowest total price we could find by $5. It features an 800 dpi optical resolution and USB receiver, and it requires two AAA batteries (included). Coupon expires after 100 uses.