Hi,
You can look at Smart-Fly.com, AirwildPilotShop.com, ChiefAircraft.com and TroyBuiltModels.com.

HI all i am new to gas. I have been building on a gold wing sbach 50cc. Im using a futaba r6008 mode on high speed mode and a smart fly power expender sport with hs 7955tg servos. I have plug in all the single white pigtail into channel 1-6 but i have 2 more wires heaven plug in cause in not sure. the are the normal wire with the white,black and red. currently left on my rx is only the 7 and 8 channel battery will leave it.. the left over two wires where should i plug in thanks

Hi,
The two end connectors are your CHANNELS A & H. They also supply power. One should plug into your aileron channel (channel 1)and the other should plug into your last Aux channel (channel 8). THESE HAVE TO BE PLUGGED IN. You should NOT plug anything into your battery channel unless it is shared with a servo channel (channel 8 for instance). If you are not clear on these instructions then please call the office.

Wrongwayrc.com also carries this product line (and A123 batt's). I like the Power expander pro. Has a safe switch that turns on/off two batteries. Also has a battery selector circuit in case a battery goes bad, it isolates it.