Lowe's Profit Up 15 Pct., Tops Estimates  ATLANTA (Reuters) - Lowe's Cos. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=LOW.N target=/stocks/quickinfo/fullquote"&gt;LOW.N&lt;/A&gt;, the No. 2 home  improvement retailer, on Monday reported a 15 percent rise in  third-quarter profit, topping estimates, aided by its expansion  into large U.S. markets.