People looking to buy an e-reader as a holiday present may be out of luck. Barnes & Noble announced Friday that the Nook is sold out and new orders won't be filled until after the New Year. A Sony official said its e-reader, the Daily Edition, will also be a hard device to find. “We’re deeply concerned that we won’t have enough to get them under the Christmas tree,” he told the Financial Times. It seems the companies have failed to find a way to manufacture enough to meet up with demand. One industry analyst said that he expects 900,000 e-readers to be sold this holiday season in the United States.