The head of Walmart.com says that Halloween sales were particularly strong. And, he thinks the upcoming holiday season will do just as well. "Customers are still spending for the holidays. Halloween was very good for us, so I suspect that Christmas is going to be great," said Raul Vazquez in a talk with Reuters.

The website may be benefiting from the fact that parent Wal-Mart (NYSE: WMT) cut holiday prices early this year, about a month ahead of the normal Thanksgiving weekend time frame.

But there could be other explanations. Wal-Mart has been especially good at tying its website to its stores. Customers can order items on the internet and pick them up at the local retail outlet, saving shipping charges. This combination of convenience and low price may be increasing use of the website.

The other reason the site may be doing well is the rotation away from buying goods in stores and toward buying online. While same-store sales at many big retailers are relatively flat, e-commerce revenue is expected to rise over 20% in the last two months of the year.

Or, there is one other explanation. Wal-Mart may be doing better than most investors think.

Douglas A. McIntyre is an editor at 247wallst.com.