A method, a computer system and a computer program product to facilitate comparison-price shopping over a data network, such as the Internet, is provided that includes a price availability feature guaranteeing a price of a product associated with product-related information stored on a server. To that end, information that concerns a product is rendered on a display in a browser window. The information rendered typically includes offered price data. A server is provided that includes a plurality of addresses in an address space, and a subportion of the plurality of addresses is associated with an identification code. Acceptance to the offered price data is achieved by storing the information in the subportion, defining agreed price data. The agreed price data is maintained in the absence of a predetermined system event.