I don't know if you are looking for wood or metal, but if you are looking for metal, try your local welding shops. Use your imagination while walking through all the scraps they seem to accumulate, i.e., broken and abandoned iron grates, doors, etc. Cruise around and see what they have laying about before you approach the owner. You will be amazed at what you see. More often than not, that shop will be more than happy to transform their cast-offs into the treasures you dream of, for very little money!