Amazon still offers downloads of Bob Knight's The Power of Negative Thinking: An Unconventional Approach to Achieving Positive Results Kindle eBook for 99 cents. That's tied with our mention from three weeks ago and the best deal we could find for a digital edition of this book by a buck. (It's also $7 less than buying a physical copy elsewhere.) This Amazon Best Seller was written by the second-winningest basketball coach in NCAA history.