Several online merchants reported record sales during the holiday shopping season, including online retail giant Amazon.com, which said popular items were iPod music players, video games, coats and jewelry. Amazon said it had its best holiday sales season ever, with more than 108 million items ordered. The company’s holiday statistics cover the period from Nov. 1 through Dec. 21. The busiest day for the world’s largest online store was Monday, Dec. 12, when more than 3.6 million items were ordered, or 41 items per second. The most expensive item purchased during the period was a pair of diamond earrings worth $94,000.