Have you even been to the Scrap Exchange? It's located in Durham, NC and is a warehouse full of industrial and retail 'stuff' that you can use to make art. I have seen bins filled with 1,000s of wine corks salvaged from a wine bar, rolls of stickers salvaged from last season's promo at the mall, long pieces of interesting plastic tubing that were the remains of industrial packaging. All these items were plentiful and oh-so-cheap. If you make art of any kind you need to visit the Scrap Exchange.