I'm not sure if the hills are alive or not. I haven't been out much lately. What I do know is that I often get questions about materials and what I use for my collages. I try to answer them all in detail, but it is quite time consuming to do so.
Every artist has a favorite handful of supplies that they rely on. Mine do not come with a song, and they do not include whiskers on kittens or snowflakes that stay on my nose and eyelashes. However, they definitely make for an enjoyable working space and a more gratifying art experience.
I tried to make an exhaustive list that would encompass different categories, from inspirational books, to adhesives and even templates. Look around and try a few of them. Perhaps, you'll discover a new favorite as well!