I use to use copy paper & Carol Doaks paper piecing paper, but since I have discovered Ricky Timm's "Stable Poly Stuff" that is all I use. It doesn't have to be removed, it remains in your quilt and washes up into a very light poly type batting. Also gives those paper piecing blocks more substance. If your looking for inexpensive, it's NOT. 50 sheets about $10. It's great that we all have such different choices.