You may be asking why the book if you have the free videos?
Well, while I’ve put links through many of the video pages, the book actually has a list of suppliers in several countries. Those in the USA are generally well-stocked, unlike some of the Amazon sellers who occasionally have a limited supply and not as many colors. Since I’m in The Bahamas, that’s my closest source. It also has a few more details for avid artisans. If you just want the videos, then the book won’t be of any benefit to you.