Once sold primarily in musty natural foods shops, organics went wide after Whole Foods Market (WFM) took over the high end of the market, earning the nickname “Whole Paycheck” in the process. In recent years the mainstream has discovered more natural foods, and big chains, including Kroger (KR) and Safeway (SWY) have piled in. Sales of organic products at Costco (COST) have doubled in two years to about $3 billion a year.