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Grocery price comparison apps are a great alternative, saving you time and money by showing you where to find the best deals. Check Out: Pocket an Extra $400 a Month With This Simple Hack.
This means the comparison service scans retail web pages to retrieve the prices, instead of relying on the retailers to supply them. This method is also sometimes called 'scraping' information. Some, mostly smaller, independent sites solely use this method, to get prices directly from the websites that it is using for the comparison.