Best Buy offers the HP Wireless Elite v2 Keyboard, model no. QB467AA#ABA, for $19.99. With free shipping, that's the lowest total price we could find by $20. Sales tax is added where applicable. Features of this 2.4GHz wireless keyboard include a USB receiver, 30-foot range, spill resistance, and more. It includes two AAA batteries.

Note that this keyboard is currently backordered, but should ship in one to two weeks.