what a great book! Ive only read the first one but its awsome. Also if you like the book and have a pc is worth buying the game id say, might be hard to find but id guess places like e-bay might have it (and probably extremely cheap these days). My favorites emporer: battle for dune, the online gaming is unreal! So all you Dune fans go buy!! 
I’ve seen the movie and the both mini series several times 
But I haven’t read the books yet. Oh and I’ve played the games too, dune 2000 was the best of them. The newest one called emperor of dune or whatever was bad 
lots of abandonware, including dune… search for abandonware on google and you should find dune if it isn’t on abandonia