Southern gardeners normally pay $5 for a 2-cubit-foot bag of pine bark mulch that they buy at their local gardening-supply and home-improvement stores to keep the weeds down in their gardens. if the price being charged by a retailer is not within a narrow range that gardeners feel is appropriate, they will use substitutions—newspaper, grass clippings, or some other kind of ground covering. when pricing pine bark mulch, a garden-supply or home-improvement retailer should use