Have you ever heard of freecycle.org? I hadn't until a couple of days ago when a friend told me about it. Think of craigslist on a smaller scale, but everything is FREE. I'm not joking.
You join a group that is the area you live in and people post things they are giving away or things they want. I have seen everything from couches to high chairs to styrofoam blocks (don't ask) being given away. The only thing you have to do is contact the offerer and pick a time and place to pick up the stuff! Of course, you provide the transportation of the items.
If you are looking for something specific and you need it fast, I might post a "wanted" message in the group just in case, but also check craigslist and ebay because you never know what will be posted. If you have time to acquire things, then this is for you!
Tip for those of you who decide to join your local freecycle group: opt to have a "daily digest" of the messages from the group. If you don't, an email is sent to you every time someone posts something and it gets overwhelming! With a daily digest, you get a daily compilation of everything posted.