Buy.com offers the refurbished Targus Wireless Stow-N-Go Keypad, model no. AKP01US, for $9.99. With free shipping, it’s tied with our mention from three weeks ago and $17 below the lowest total price we could find for a new, factory-sealed unit. It includes a USB receiver, which you can stow beneath the keypad when not in use.
Note: A 1-year warranty applies, but it’s not clear who backs it.