We're sorry to hear YouTube is blocked where you are! We put our videos on YouTube to help us reach as many learners as possible, but we realize this might not work for everyone. Many teachers in this situation rely upon a YouTube download tool, like KeepVid; here are some instructions. Another option is to see if you can convince your organization to whitelist, or allow, our YouTube channel.
We also have an offline version of our site, which you can request by emailing firstname.lastname@example.org. We update our offline version every 1-2 years, so may not see every video we have, but you can keep downloading new versions as they become available.