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This one is incredibly, tragically rare. It was a television special, I think the first Muppets television special, and it was first broadcast in the 1971.
http://www.imdb.com/title/tt0068613/
It's a wonderful show, combining live actors and various early Muppets: Kermit, Robin (the little frog), and the first appearance of Sweetums the ogre. There are a lot of songs, lots of comedy...it's a lovely, funny story.
You'll probably find the songs running through your head again and again. As a kid, I actually didn't know that it WAS a TV show; we had the soundtrack, which was pretty much the complete audio of the show on LP (along with a large, beautiful photo-album). When I finally found the videotape on eBay, I was absolutely delighted.
There's also a surprise or two. Watch for a scene when Kermit gets drunk on elderberry wine in the background! That would never make it past censors today.
The sad thing is that it has never been released on DVD, and I guess it probably never will be. I had to scour eBay for a VHS copy. It's not bad, but every time I play it for my son I worry that the tape will snap or tangle.
I wish they still made TV like this!