allelectronics.com is selling a 6-channel 75Mhz Transmitter/Receiver set for only $29.95. Keep in mind that this is a ground freq radio if used in the USA (robots, model cars and boats).
It will require some hacking since the receiver requires a decoder circuit to interface with your servos. They have posted some information on how to do that.
Details: Vex R/C System.
Cheap Surplus 75Mhz R/C System
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