Wal-Mart Price Differences
This is a good illustration of what a weasel company Wal-Mart is. The guy bought a DVD player at his local Wal-Mart for $139 and then found it on the Wal-Mart.com website for $127 with free shipping. He went back to ask for a price adjustment and they refused because, well, they already had his money.
Try doing the same thing at Target or another major retailer and they will almost certainly refund you the difference. Why? Because its good business to treat customers fairly.
Wal-Mart doesn't care about good business, they care about their profit margins.