Rockler, Klingspor, Woodcraft, or Raleigh Durham Rubber and Gasket. Klingspor carries "Woodstock International" brand, Rockler their own brand, which is imported, Woodcraft's is made in the USA, and Raleigh Durham Rubber and Gasket sells both PVC, and polyurathane by the foot. Klingspor, with the NC Woodworker discout, is cheapest on aluminum blasst gates, FYI.