Fleming Cos. and Supervalu Inc., both already Kmart suppliers, are vying for a deal to procure and distribute the whole Kmart Corp. enchilada -- all the grocery and consumable merchandise for the Big Kmart and Super Kmart stores. In a rare grocery trade public relations moment, the two contenders are airing some of their bargaining chips in an effort to win Kmart's primary supply contract. It could be worth an estimated $3.7 billion in annual revenues, but neither contender is revealing the terms of its bid.