Wal-Mart is launching a new tool to help shoppers make sure they get the best price.
It's called Savings Catcher.
Available in select cities, all you have to do is enter your receipt number online.
Then Wal-Mart checks advertised prices in your area.
If the savings catcher finds a price lower than what you paid, Wal-Mart will make up for it.
They say they'll give you the difference on an e-gift card.
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