I buy my fusible when it goes on sale at JoAnn's--the cheapest and thinnest they have. It is about (or was when I last bought it) $.50 a yard. It also helps if you have access to a large iron press and worth buying if you are going to be doing many. Here is a link to one
https://www.amazon.com/PowerPress-HP...50011_3?_encod . I have it works.