By Stacy Malkan

The nation's largest retailer is going organic, and not everyone thinks it's a good thing. Wal-Mart is expanding its sales of organic products, from produce to cereal to macaroni and cheese, bringing along a series of name-brand companies along on the organic bandwagon. The company is aiming to sell organic foods - which it believes many of its customers want - at prices closer to non-organic foods than other retailers presently offer.