Best Buy is now saying that "overwhelming demand for some products" could mean a late Christmas for some. - 

A final note. A bit of not-so-cheery news for some holiday shoppers who ordered online from Best Buy: The country's biggest electronics chain is just now advising some of its customers that it won't be able to deliver their orders in time for Christmas. It blames "overwhelming demand for some products."

Best Buy won't specify how many orders are affected. But it does say some were placed as early as November.