I have the Marlin too, but I think the 44 is a lot more gun than the Mini-14, in the woods after game.
I have never actually seen one for sale, and you dont buy what you dont see on the shelves.
Same for the Marlin 45ACP Camp Rifle, I saw one 9mm once, already sold, but I never saw a Camp 45 on the dealers shelf.
I would trade my Marlin 44 Mag lever gun for a 45 Camp rifle, because finding a 44 is easy.
I hunt the west in places that go from 10 feet to 600 yards, and the long range rifle works better at short range, than the short range rifle works at long range. But, I still have a soft spot for carbines.