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If said product is cheaper, users can then purchase the item for delivery in a single click.
While we love the search and quick purchase options, the app [iTunes link] ultimately isn't that useful because it only allows users to compare a single store price with the prices of Amazon and its sellers.
RedLaser [iTunes link] (which was acquired by eBay in June and has now been fully integrated into eBay's primary iPhone app), on the other hand, lets users scan an item's barcode and compare it with a full range of nearby stores and online merchants to determine the best price.