Rating information is maintained that is associated with one or more sources from which a product of interest can be purchased. Search criteria is received from a user that defines a product of interest. A plurality of sources are selected from which the user can transact for a product that satisfies the search criteria based at least in part on the rating information associated with one or more sources in the set. One or more sources can be determined from the rating information that have an acceptable rating value, or alternatively, a higher rating value than other sources in the set. A plurality of links may be displayed that individually locate a corresponding one of the plurality of sources. The plurality of links may be positioned, for example, based on the referral compensation provided by the sources of one or more of the links. The link that identifies the source with the highest or higher rating values may be identified to the user.