Paulo Coelho

if you live in USA, you can give away The Alchemist (English and Espanol) for free.
All authors who have their books in the list waived their royalties.
Below a short explanation from Carl, the organizer:

Hello, World Book Night friends:

The fun is beginning: The WBN 2013 book picks are official and the giver applications have opened!
I am really excited about the selection of books for World Book Night 2013, and I know you’ll be pleased with them, too. As I said in our press release today: “This isn’t a best-books-of-all-time list; these are contemporary or classic books that appeal to a wide range of new readers. We looked for diversity and variety in all things: subject matter, age level, gender, as well as ethnic and geographic considerations. Last year’s givers also got to nominate books. This is a beautiful mix with, I hope, some old friends and nice surprises! We believe that the wide range of books being offered will appeal to our volunteer book givers and, in turn, to a half million new readers.”
To see the 2013 books, please visit our Books page.

We’ve also opened the giver applications, and I have good news for you. The application process will be open until January, so you have plenty of time to read up on the books and think about where you want to personally hand out your 20 copies before you apply. I recommend you check out the Application Guidelines in advance as well. It’s a great resource and will help make the whole process a lot easier for you.

If you want to give away books to celebrate the event, follow this link to apply to be a book giver