Abstract: A network based system to facilitate products and services tradeups wherein users can efficiently trade their old or used equipment for the latest models of the same, or different equipment. The invention allows a user or a trading entity to communicate with a service entity over a global network such as the Internet. The service entity will present a user interface to the user for conducting the tradeup and other types of transactions. If the user chooses the tradeup transaction, the user will be prompted to describe used product and the desired product to be traded for the used product. The service entity will search its database for price or value information, based on the description from the user. If the service entity is unable to find information in its database that matches the user descriptions, the service entity will search remote web sites to find the price or value of the used and desired products.