Abstract: A computer implemented method and system for managing a collective purchase of a sale item in an interactive environment, provides a reverse auction management platform to buyers and sellers. A lead buyer selects a sale item via a graphical user interface of the reverse auction management platform and initiates a deal. The reverse auction management platform acquires deal information and a price range for the selected sale item from the lead buyer and creates a deal group for the selected sale item. The reverse auction management platform finalizes the deal based on deal finalization criteria and initiates bidding among the sellers of the selected sale item based on the deal information, the price range, and the finalized deal, to select one or more sellers based on the bidding and/or predetermined seller selection criteria for supplying the selected sale item to the deal group for a price within the price range.