at new deals that could increase its access to the airwaves, including potential transactions with Leap Wireless International (LEAP), Dish Network Corp. (DISH) or MetroPCS Communications (PCS), sources say, the Wall Street Journal reports...REUTERS: Wal-Mart Stores' (WMT) turnaround appears to be working by using simple strategies like undercutting competitors by a penny on a gallon of milk, helping to restore its image as the go-to retailer for budget-conscious Americans. The company reports fiscal Q4 results on February 21, and analysts on average expect to see the company's best U.S. sales performance in over two years, Reuters reports...BLOOMBERG: Thermo Fisher Scientific (TMO) CEO Marc Casper said the laboratory instrument maker will use cash this year to pay down its $7B in debt and continue to seek bolt-on acquisitions, Bloomberg reports.