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RC Universe - A great resource about everything RC. Check out the Airplane Forums.

Tower Hobbies - Not the cheapest, but close. They have, by far, the largest selection.

CheapBatteryPacks.com - A great place to build custom battery packs for cheap.

BatterySpace.com - An even better place to buy batteries. They sell cells in bulk as well as very low priced (and high quality) packs.