Amazon's physical bookstore in Seattle might not be its first and last. According to The New York Times, the e-retailer is planning to open more brick-and-mortar bookstores in the future. Sandeep Mathrani, the chief executive of a mall operator, claimed during an earnings call (and before NYT published its scoop) that Amazon is looking to open as many as 400 outlets. That would put the company in direct competition with chains like Barnes & Noble that operates over 600 stores. NYT's source said, however, that the online retailer's plans are much more modest than that.