Abstract: Systems and methods for targeted electronic messaging within a brick and mortar store are disclosed. A shopper tracking system tracks the physical location and collects shopping behavior data of a shopper located within a brick and mortar store. The shopping behavior data is supplied to a real time bidding system. When a shopper moves within a predetermined distance from an electronic sign, the shopper tracking system signals the real time bidding system to conduct a contemporaneous auction and supply a message provided by a winning bidder, which is displayed on the electronic sign.