Radical RC is a great source. I've bought from them and have been very satisfied with their product. They also have great support. I bought a LiPo battery pack from them one time. When I got it, I put it on the charger. But, I accidentally messed that up and it started to swell. I called them, they said to send it back and they replaced it.. even though it was my fault.

Good people to do business with.

Another great source is

http://www.hangtimes.com/

They carry the NoBs battery packs that have been recommended by Minnflyer and by Red Scholefield on several occasions.

CGr.