Meritline offers the refurbished Logitech M315 Wireless Optical Mouse in Colt Matte Silver, model no. 910-002189, for $13.99. Coupon code "MLCU14JN" cuts it to $8.99. With free shipping, that's $6 under the lowest total price we could find for it new in any color, although we saw it refurbished for a buck less last winter. This mouse's wireless receiver features a compact design, so it can be left in your laptop's USB port.
Note: A 90-day Meritline warranty applies.