I stumbled across something yesterday that I thought was pretty awsome. Not all of us have access to a town dump for scrounging, so this is almost as good. It turns out that some Home Depot stores sell what the call "cull lumber". It's basically scrap lumber in lengths around four feet, and is ridiculously cheap. For instance, yesterday I managed to build myself a respectable set of shelves, four feet high and two feet wide, for just four dollar and change.