It costs about 0.5 cents per book to "print" 3,000 books to a retail-priced SD card, so paper books are still expensive by comparison. The only way paper is clo

It costs about 0.5 cents per book to "print" 3,000 books to a retail-priced SD card, so paper books are still expensive by comparison. The only way paper is close to competitive is if the kids only get access to a couple of books, which is dumb if we're ignoring licensing.