It's a curiosity of how the Internet works that a shopper using a search engine to find a flat-screen TV probably will not turn up Costco Wholesale, a major television vendor and the country's largest retailer after Wal-Mart.
Costco.com is not built to attract online hits, but it does decent business — about $2 billion in sales a year. It does so by offering everything from caskets to an 18.88-carat diamond, while attracting customers even more affluent than the average shopper at its warehouses.
