Lenovo has their Lenovo Multimedia Remote with Keyboard (N5901) for $60 - $37 off with coupon code USP1N36336
[Exp 11/21] = $23
with free shipping. Features a track ball, palm-sized dimensions, USB nano dongle, 2.4GHz radio frequency, and a 10 meter control distance. Lenovo must have a million of these lying around.