Image may be NSFW. Clik here to view.By Panos Mourdoukoutas Costco continues to gain popularity among superstore/wholesale club shoppers, as evidenced by strong online and in-store sales in October and rising foot traffic in the third quarter. This week, the Washington-based wholesale club reported net sales of $20.03 billion for the four weeks ended Nov. 3, up 7.2 percent from $18.68 billion […]