Just like PayPal and Square, the online retailer is planning to launch a device that plugs into smartphones and tablets so that they can be used to validate card payments. 9to5Mac has managed to get its hands on a set of internal documents from US retail giant Staples that detail an Amazon Card Reader that will go on sale starting on August 12 and that it is going to be selling for $9.99. Adding fuel to the fire is the fact that earlier this month, Amazon quietly launched a mobile wallet app that is compatible with Android smartphones as well as Amazon's own devices. It can currently be used for storing gift cards, membership and loyalty cards;



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