Meritline offers the refurbished HP K2500 Wireless Keyboard in Black, model no. E5E77AA#ABA, for $13.99. Coupon code "MLCKW23ENL1" cuts it to $10.99. With free shipping, that's $7 under the lowest total price we could find for a new unit. It features Windows 8 compatibility.
A 30-day Meritline replacement warranty applies.