The products sold by Shoppingtale are derived from advertising merchandise exchange. That's why the offers are while products last.

In the advertising industry there has always existed the concept of "merchandise exchange" (advertising bartering), a kind of modern barter, through which a company can purchase advertising space in exchange for merchandise that the company itself produces.

Advertising concessionaires, in order to monetize the merchandise that companies have given up in exchange for advertising, sell the merchandise at heavily discounted prices to companies such as Shoppingtale, which in the jargon are called Barter.