This popular retailer has returned over 250% over the past five years, more than double the S&P 500.Big-box retailer Costco Wholesale (COST 0.31%) has dazzled Wall Street with a breathtaking 250% total return over the past five years, easily trouncing the S&P 500. The company's famously low prices, wide product selection, and popular meal deals (like its $1.50 hotdog) have created a sticky customer base.It's a simple formula that has built Costco's brand and competitive advantages into a juggernaut. I expec ...