Price mining and product re-pricing data processing systems and methods are disclosed. A computer system is configured for displaying (e.g., on an electronic display associated with a particular product in a brick-and-mortar store) a first price for the particular product. The system monitors one or more competitor websites for competing prices, adjusts the first price to a second price if the competitor's pricing for the particular product differs from the first price and updates the first price to the second price on the electronic display. In various embodiments, adjusting the first price to the second price occurs substantially automatically. In some embodiments, the system tracks price change trends of competitors for one or more products and determines a predicted price change prior to an actual competitor price change. In some embodiments, the system changes one of the first price or the second price to the predicted price prior to an actual price change by the competitor.