Wal-Mart Stores Inc. will start selling build-your-own-computer components in more than one-third of its U.S. discount stores this month as it looks for ways to tempt shoppers to buy more than just low-margin food.

Wal-Mart currently offers only prepackaged bundles of personal computers and accessories in most of its stores. With the build-your-own-computer counters, shoppers can choose between several different components.

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