Heck the only ways to get the original version of a story which has been made into a movie is to either go to a library, hoping for a copy dated a few years before the movie, or go to a used bookstore looking for one that you can trade for (my usual method). Haven't been able to do that for a few years now, but the internet lets me find some darn good reading as well.
They don't typically remove a literary work just because a movie studio releases their own version of a story. The studios pick books which have already proven themselves, so those stories aren't going anywhere. They do go out of print, eventually, but they're still available one way or another.
But that's another reason why it's best to read the book before it's make into a movie, rather than years or decades later.