You get modules from $17 for a RX/TX pair for 9600 and pretty good range to a more expensive 915MHz - 40,000bps - 90m Range FSK Modulation for about $30 bucks.
Bands range too - 2.5GHz and so on. I have used their cheapest little 315, 418, and 434MHz - 4800bps - 150m Range to download GPS plot info from my bike to the home computer. It works really cool - just like wireless RS232 cable HA
The system im thinking of designiong would need to be encoded so it only works with the corresponding transmitter and reciever. So it doesnt interface with any surrounding products.
Wi-Fi Toys: 15 Cool Wireless Projects for Home, Office, and Entertainment
ISBN: 0764558943
Author: Mike Outmesguine
Publisher: John Wiley & Sons
Size: 9154 KB
Thanks for the great help help guys. The system im thinking of designiong would need to be encoded so it only works with the corresponding transmitter and reciever. Any ideas on that front?