What Thrasher said.
I've looked into this too, and you're pretty much going to be dealing with either Chinese resellers or buying direct from a manufacturer like Kanger, Joye or Innokin. Some manufacturers will only give you an "authorized reseller" designation if you have a brick and mortar establishment, or you agree to buy a certain quantity over a certain period of time.
There are no US wholesale outlets (that I know of) offering prices that are competitive with FastTech, PriceAngels, Health Cabin or Heaven Gifts.