I buy both Hobbs 80/20 and polyester batting in rolls from Marshall's Dry Goods. Definitely the best price! They have many different weights (thicknesses) of the poly battings, but they are so "puffy" I buy the thinnest one they have. I think it's 5 oz. And it's still plenty puffy. I use that for charity quilting because its so economical, but my favorite for personal quilts is the 80/20. It's a dream to machine quilt!