I only recently discovered that Apple iBooks store has an amazing number of free books, from Chaucer to Cervantes to Karl Marx to Dickens, Hawthorne, F. Scott Fitzgerald, Jules Verne, Arthur Conan Doyle, Agatha Christie and over a hundred more renowned and less known authors. Just go to "Browse" and select "Free". One note: if you want Shakespeare, the free iPad app from the App store is better than the free iBook.