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Buy.com has the Trust Vista Remote Keyboard for $19.99 with free shipping.
Final Price for this deal: $19.99 + Free shipping

Description:
Wireless keyboard with integrated 2 button trackball, scroll wheel and 16 special function keys; the ideal controller for Media Center PC's Mini USB receiver included using advanced 2.4 GHz wireless technology for excellent interruption-free operation up to 10 meters (no need to buy a separate receiver) Enjoy the full Media Center experience: control movies, music, photo albums/slideshows, presentations, games or browse the internet from any comfortable location Perfect for chatting, writing E-mail messages and letters, entering passwords or any other alphanumeric input Also suitable to control live or recorded TV programs, radio stations, etc. (depends on the configuration of your Media Center PC and internet connection) Also works with the XBOX.