Looking for an application that adds the units of buyers.

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Does anyone know of any add-ons or app for shopify that add up the offers for a certain price? Something similar to auctions. For example, I have 1.000 units of a product priced at $ 1. And among 4 bidders they want to buy the 1,000 units. But if one goes down, the price changes. The price scale per unit its defined in advance.

Thank you very much in advance!