Aileen that fact that you recognize that you are benefiting from the book and shop is a good thing. As long as you will not be selling the quilt.
You can always pay it forward in the future. Fully acknowledge where the idea came from in any online posts of the finished project.
May of us here post links to tutorials often we do not need to 'buy the book' after watching the online tute.
My budget is tight and I am heading to my LQS tomorrow because they have all their fat quarters on sale at a great price. I cannot afford to buy yardage from them at this time or take classes. I need FQ for my SS