These are the books that Ray Ruppert has written.
So, I have several places where you can find my books. You can find them on my personal website or directly from Amazon. You can find various Ebook formats at Smashwords (free or pay what you want). To keep things a bit easier, I'm pointing you there instead of trying to keep various pages like this one update. Ray's Author Page on Amazon
Ray donated his books (except those which he co-authored) to Proverbs Three Nine Foundation so that royalties from sales would be used for the Lord's work as well as ensure they would be available after he is gone.