A Muppet Family Christmas is a great 1987 made-for-tv special that includes every imaginable muppet. We have a tape of the show as it appeared on television and were so excited when we found it on DVD. Unfortunately, the DVD leaves out so much of it that it's not worth watching. We gave the DVD away and continue to watch -sparingly, in an attempt to prolong the life of the tape- our home recorded version. This is a sad situation and just another example of how the byzantine copyright regulations make things difficult for all concerned.
The DVD is out of print but is available from vendors through Amazon.com. There's a description of the various editions here.