The series is currently sale-priced at $49.99 again on Vudu. I bought the last episode to see if it was really 4:3 before I bought the whole series.
It’s not 4:3. It’s not only 16:9, but it’s letterboxed 16:9, so even if you take the Vudu player fullscreen on your computer, there are still black bars on all four sides of the image.