This book changes the way you think! Tony is an amazing speaker. At a seminar in London in 2001 he got 5.000 attendees and ME to do the firewalk at the end of the first day! When I doubt myself I have to remember the firewalk and I get a new perspective! About $7
If you are well off, read the book. If you are just out of college, read the book. If you can't read yet, have your folks read you the book. If you need to get back on the straight and narrow, read the book.