Most of the materials for this project were purchased at the Habitat for Humanity ReStore. If you are able, the Habitat for Humanity programs in communities all over the US are a great way to volunteer your time and support. There are many ways to help. From actually volunteering at a build site, to donating new or gently used building materials and supplies. There is another way to help them, and that is to shop at "ReStores". These are stores run by Habitat for Humanity programs that sell excess donated goods. Donating to and Shopping at these stores for materials for your building projects not only helps their programs but it also helps our environment by keeping those materials out of landfills and in the workshops of creative people.
Now then, having removed myself from my "volunteer to save the planet and your community" soapbox, I'll continue on with this instructable. No, but seriously, support Habitat for Humanity. They're good folks doing good things everywhere.