http://www.towerhobbies.com/listings/cat-cat-c2.html
you can buy individual cells and bars and build your own or buy pre-built. i used to shop at this place all the time when i raced rc cars....
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don't think their prices can compete. the race cells are much better but mainly at high draw. for our purposes i think the ebay packs will suffice at 1/3 the price. wouldn't race with them but would be good practice batts for screwing around.