The present invention relates to a computer program product for providing a system for selling shipping services online. The system comprises data recording medium, product selector, shipping service information collector, shipping parameter collector, shipping option computing module, shipping service selector, shipping service notifying module and transaction concluding module. The product selector is for selecting a product by a buyer. The shipping service information collector is for obtaining information about shipping services from carriers. The shipping parameter collector is for obtaining information to specify shipping parameters. The shipping option computing module is for computing available shipping services. The shipping service selector is for selecting a shipping service related to a given carrier. The shipping service notifying module is for generating a shipping service request and transmitting the request to the carrier. The transaction concluding module is for receiving a response to the request and transmitting the response to the buyer.