Rainbow Foods, which had as many as 30 locations five years ago, will be down to a single location by the end of March. The Star Tribune reports on the closing of one of the final two Rainbow stores - Jerry's Enterprises said it will shut down the Richfield Rainbow store it owns on West 66th Street as of March 16. That leaves the Rainbow in Maplewood, which is owned by Eden Prairie-based Supervalu (NYSE: SVU). A Supervalu spokesman said there weren't any plans to close that one. The Rainbow...