A product display apparatus including a product supply module that includes a support frame and defines a storage area. A door assembly coupled to the support frame is structured to provide bulk access to the storage area in an open position and prevent bulk access to the storage area in the closed position. A return area is defined between the support frame and the top of the door assembly while a retrieval area is defined between the support frame and the bottom of the door assembly. A modular display portion is coupled to the door assembly that extends into the retrieval area to define a single unit retrieval opening. A load block member may be disposed in the retrieval area to permit retrieval of a product, but inhibit return of a product. A retrieval detector may be configured to detect when a product has been withdrawn through the retrieval area and generate an alert upon detection of rapid product removal.