I have found or accidentally bumped into a great site on how to get books for free.  No seriously, really!   www.PaperBackSwap.com  is a site where you register for free and type in any books you want to give away.  And that includes novels, science, fiction, non-fiction, textbooks.  Any book in GOOD condition, in turn you get to pick from their library of over 1,000,000 books for FREE.  So check it out today and have fun,  this may just be the site you've been looking for.