I recently joined a group with the Discovery Network called the Discovery Network Ambassadors. Our job is to learn about all the cool tools that are available on the Discovery Network and then share them with our colleagues. A lot of teachers have used the Discovery Network in the past for videos (they have a great collection of non-fiction videos if you haven't used them!). As the media specialist, I'm hard pressed any more to buy DVDs because there are so many good ones available for free (at least for us because our district buys the Discovery Network for us). Video is a great way to engage your students immediately (who doesn't like to watch a video?) and with the new Common Core Standards, comparing video to text is a skill that students are expected to have. One of the things that also makes this great, is that the videos are arranged in a searchable database, which allows you to filter your search by grade level, by subject, even by the kind of video you'd like to have. It's very versatile. Here's a video of how you can narrow your search.