The Wal-Mart juggernaut. Wal-Mart is targeting yet another industry with fat margins: personal computers. Sam's club is offering $299 PCs running Red Hat Linux while Wal-Mart is offering $199 PCs powered by Lindows Linux. Nobody thought Wal-Mart would move into groceries or PCs. If you're not already competing with Wal-Mart, you will be soon. Nobody is safe.