Best Buy offers the Logitech M525 Wireless Optical Mouse in Black (pictured), model no. 910-002696, or Red, model no. 910-002697, for $19.99 with free shipping. (Amazon charges Prime members the same for the red version.) That's the lowest price we could find by $11. (We saw it for $5 less on Black Friday.) Sales tax is added where applicable. This wireless mouse features a unifying receiver, micro-precision scroll wheel, ergonomic design, and more. It requires two AA batteries, included.