SAN FRANCISCO (AP) -- Amazon.com Inc. saw earnings grow in the third quarter as shoppers bought more goods and services, yet costs also rose because the company is having to build new centers to fulfill those orders. Shares fell in extended trading.For the July-September quarter, Amazon earned $231 million, or 51 cents per share - 3 cents more than what analysts polled by Thomson Reuters expected, on average. That compares with a profit of $199 million, or 45 cents per share, a year earlier.Revenue rose 39 percent to $7.56 billion, higher than the $7.36 billion analysts expected. It was $5.45 billion a year ago, a quarter that doesn't reflectthe November purchase of shoes and apparel retailer Zappos.

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