I do see these. $55 is a little much.
LiftMaster 850LM Universal Gate and Garage Door Opener Receiver - Garage Door Hardware - Amazon.com
A little more like it:
Solidremote 12V - 24V Secure Wireless RF Remote Control Relay Switch Universal 2-Channel 433MHz Receiver with 2 FCC ID Transmitters for Garage Door Openers, Cars, LED Lights & More (KIT-1) - - Amazon.com
I think I will keep my eye out for someone throwing out a garage door opener, and steal the electronic innards.
