Attention: This 20% offer will be fulfilled via an Amazon gift card that will be sent to the email you provide. We have priced both versions (kindle or physical copy) as 20% off the current price in US dollars. In some cases it may be cheaper for you to buy the book directly somewhere else. The reason we are offering it this way, is our hope that you will read and give an honest "verified" review of the book on Amazon. Thanks!