Lenovo offers its Lenovo N5902 Multimedia Remote with Keyboard, model no. 0C51503, for $69.99. Coupon code "USP1AU241503" cuts the price to $19.99. With free shipping, that's $3 below our June mention and the lowest total price we could find by $6. This 2.4GHz non-backlit wireless keyboard features a USB nano dongle, range of up to 30 feet, and Windows media hotkeys. It requires two AA batteries.
There's a less expensive way, and then there's the way that works for you. The two may not be the same.