GILBERTSVILLE, Pa. (WPVI) -- A popular market in Montgomery County is preparing to close its doors after nearly a century in business.Zern's Farmers Market announced its last day will be on September 30.The 20-acre complex on Route 73 in Gilbertsville has been for sale for nearly two years with an asking price of $7-million.Zerns was founded in 1922 and sells everything from meats, cheeses, and produce to toys.------