Amazon offers downloads of Tim Ferriss' Tools of Titans: The Tactics, Routines, and Habits of Billionaires, Icons, and World-Class Performers Kindle eBook for $3.99. (Barnes & Noble charge the same for the Nook version.) That's tied with our March mention and the lowest price we could find for this Amazon best-seller now by $12.

This entrepreneurial guide from the New York Times Bestseller Ferris includes a foreword from none other than Conan the Librarian himself, Arnold Schwarzenegger.