ITEM IDENTIFICATION SYSTEMS AND METHODS

A source identification service is described that identifies items offered for sale on a network-based service in need of additional sources. The source identification service may identify an item in need of sources based upon user requests to the network-based service for information regarding the item. The network-based service may present users with search results including information regarding items provided by the network-based service in response to the request. Users may further select an item from the search results and receive detailed information from the network-based service regarding the item. The source identification service may determine the popularity of the selected item from the item search results and/or analyze the item search results to identify whether the item is in need of additional sources. Relatively popular items and/or items for which relatively few search results are returned may be identified as in need of additional sources.