Love this series. Also can't find it for Region 1, and watching it on
Youtube is a hassle.
Season 1, full playlist. Unfortunately, Youtube no longer gives you a player (well, it won't work in phpBB); so to play the videos in order you have to click on the Youtube icon and watch it IN Youtube. However, after the video ends, usually the next episode is somewhere on the page of thumbnails.
Season 4 (final)