There are free online (ebooks) available from several sources. These can be read in special book readers, such as Kindles, Nooks, or Sony readers and also in many smartphones and, of course, computers of all sizes.
One good source is your public library: first go to the library and take out a card. Then order books from your computer or smartphone.
Another source, especially for classics and other out of copyright books, is Project Gutenberg. Check out this biography of Henry Ford.