Have you heard of Freecycle? It's a nonprofit global network similar to craigslist where you can search for items people are giving away for free. Similarly, you can post an item that you'd like to get rid of.
Why is this a good idea? It touches on two of the most important aspects of saving the planet: reusing and keeping stuff out of landfills. It could also save you money on that desk you want for your apartment. A win/win situation!
Visit the freecycle website