How do I get free eBooks for newer books, not just the clics?

I know where to get free eBooks for clics and others, but I'm wondering if there's a good site to get free eBooks for contemporary titles (things written in the past 20-30 years or so). I'm especially looking for "Ender's Game" and the other books in the series by Orson Scott Card. Don't worry, I've purchased them all in print, I just got a Kindle and don't want to have to pay for all of the books a second time just to have it on the Kindle. It would be just over $100 (ouch!) for something I already purchased. Any advice? Thanks!