Jose Gomez Marquez can sometimes be spotted in elec tronics outlets near his home in Cambridge, Mass., using his iPhone to methodically photograph items on the shelves. He s taking pictures of barcodes, so he can use a mobile phone application called ShopSavvy. Once he s taken the photo, the app searches a database of retailers brick and mortar and online for prices. Sometimes the best deal is in the store, but other times he ll find, say, the same gadgets at Amazon.com for 30 percent less. Either way, he says, that s gratifying.
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