What is reverse sourcing?

Working backwards: start from a proven Amazon product, find who sells it cheaper.

Reverse sourcing flips the usual direction. Instead of scanning a store and asking "does any of this sell on Amazon?", you start from a product that already sells - an ASIN, a category bestseller list, or a successful competitor's storefront - and search retailers for a cheaper source of that exact product.

It is the sharper tool of the two directions because demand is already proven; the only question left is supply. Storefront-based reverse sourcing is particularly direct: it shows you what sellers like you are successfully selling right now, and then hunts the retail price for it.