A system and method for generating an electronic catalog for online computer users is disclosed. Item information from a seller site is retrieved based on a webpage template that corresponds to a structure of the seller site. Item information is stored in a database of item listings. Display of an item listing from the database of item listings is caused. A drag and drop selection of the displayed item listing is detected. The item listing is arranged on a page of a computer-generated electronic catalog based on the drag and drop selection of the item listing.