If you see a construction site or a renovation near your house, ask the contractor or site manager if you can have some of the scrap building material. They usually will be happy to oblige you as long as you don't get in their way. They are going to have pay to dispose of the refuse so any that you take off their hands will save them money. It's a great way to get scraps for fire wood, wood for small projects, or old bricks to use in your garden. Of course, always ask permission before removing anything from a construction site!
This is a really good idea for crafters....especially to get nice pieces of 2 x 4's and such that can be used in dolls, etc. My only advice is to be sure you can use the stuff you collect and haul away. My hubby and I used to be big into craft making and we did just that several times but then got away from the crafts but still had so much of that stuff stored in our garage.