Disclosed are various embodiments for selecting catalog items for display on a network page. The catalog items have corresponding catalog item identifiers and catalog item representations. In response to a network request, a response is received. The response includes catalog item object identifiers but excludes the corresponding catalog item object representations. At least one of the catalog item object representations is requested using the corresponding catalog object identifier. At least one of the catalog items is selected for inclusion on a network page. The selection is based on an attribute in the catalog item object representation. The network page is displayed to a user.