I had the same problem when I started quilting a year ago. I really wanted to make comforters, but I couldn't find batting that was fluffy enough. Years ago I used to make comforters, and I easily found fluffy batting.
Maybe you could google comforter batting? What I ended up doing was using two layers of high loft batting, but now I have "given in" and am making flat quilts. It is easier to machine quilt them, that I know.
I hope you find what you need.