I have a 2.4GHz wireless system that I'll be flying soon in Buck's A10X. I bought mine complete with a high gain antenna, a 12V RX and video demodulator, and the camera/TX assembly used for about $100. The new systems can be found here:

[link=http://www.boostervision.com/boostervision/default.htm]BoosterVision[/link]

Basically they just repackage all of the components without any apparent changes - I can track down the OEM supplier(s) if anyone is interested, you might be able to put someting together fairly inexpensively.

Barry