A computer-based method and system for tracking a price change of a purchase made using a transaction card over an interchange network is provided. The interchange network includes a price tracking computer device in communication with a memory device. The method includes receiving, at the interchange network, transaction data associated with a purchase of an item by a cardholder using the transaction card, transmitting via the interchange network an authorization message in response to the purchase of the item, directing at least some of the transaction data to the price tracking computer device including a purchase price of the item, and using the price tracking computer device to track changes in a current asking price of the item, and compare the purchase price of the item to the current asking price of the item.