The party is getting crowded.Amid rapid expansion by specialty retailer General Nutrition Centers, the successful introduction of a store-within-a-store concept by Wal-Mart, strong promotional efforts by Rite Aid and other drug chains, and aggressive pricing across the board, supermarkets find themselves just one of many options for the swelling ranks of vitamin and herbal-supplement consumers.What

The party is getting crowded.

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TAGS: Walmart