Two years after going public as a fund managers’ favorite, New York City-area specialty grocer Fairway Group Holdings Corp (FWM.O) now sees its shares selling for less than a pack of organic gum. As middle-income outlets like Costco Wholesale Corp (COST.O), Wal Mart Stores Inc (WMT.N) and Target Corp (TGT.N) expand their organic offerings, the companies that pioneered the trend are being left behind. The number of organic items now available in traditional grocery stores is up between 35 percent and 50 percent over the last year, according to estimates from investment bank Piper Jaffray.