Trade Supply Group | 2,486 followers on LinkedIn. Trade Supply Group is comprised of Manhattan Laminates, Simon’s Hardware & Bath, Water Mill Building Supply, Roberts Plywood and Central Plumbing in New York; Country Lumber, Chapman Lumber and Washington Supply in Connecticut; and Hardware Designs in New Jersey. Under these brands, TSG offers a full service, end-to-end residential, commercial, and industrial building supply distributor to the mid-Atlantic region of the United States.