Landlers on video

Since this question is often asked and the answer is not so short and easy, I've compiled this page.

Generally I know just of a few video tapes which are all available from the same source. I have not seen these video tapes, however, I think they show several dances performed in traditional style and I am sure they are authentic.

Please tell me if you get additional information about this topic. - Thank you!

Dances on video (the Landlers are mentioned there)
The "Landler"
The Sound of Music
Ordering working material