Note that you should never buy raw cells from Amazon. They are always fake or under-spec. At the very least, this seller claims "Multiple Protections" when this is a fully unprotected cell.

Distributors usually won't sell to regular consumers, but there are specialized retailers who base their reputation on selling quality goods, usually to the RC, flashlight, and vape market.

FWIW, this is definitely the opinion among Ego tool users on reddit. The aftermarket stuff comes with a discount and the possibility of a free surprise inside every box.