Ilaps (
http://www.rclapcounter.com/index.html) is good to start your club as it cost $140 for a decoder and $40 for a sensor that can cover 14.5 inches, so an average 6 foot width track you will need 5 sensors. The transponder cost $40 each or $350 for 10. You can get free software like flipside racing and does announce position and fast laps and is so easy to use. We use this system for Mini-Z racing
AMB is industry standard for 1/10 so when your club gets more funds it might be a good upgrade down the line.