There’s a 3rd Monty Python and the Holy Grail DVD out now - the Extrordinarily Deluxe Edition. Apparantly, this one even has the correct aspect ratio that the other two releases didn’t.
I sold my first one to get the second, but never got around to it. Good thing I waited.
I bought the first one, then the second one, and while not having the correct aspect ratio (who knew?) is annoying, I’m not buying this one. Enough is enough. The only really compelling new feature would be the soundtrack album (which contains sketches written especially for it) but I already have that.