Most of my classmates bring two bags full of books to class every day. I can't help laughing when I see them -- I never bring the casebook in class! And the idea of scanning/copying books is really funny! LOL
I agree the case book isnt really necessary to bring to class, as long as you brief the case and are good at doing it thats all you should need to answer the prof questions.
If there is a point you may have missed just make a note and go back and look at the case again.