Muslin varies a lot in quality. I purchase the cheapest at JoAnn's by the bolt and use it for making patterns for garment sewing and occasionally after I wash it several times so it has shrunken all it's going to shrink as foundation for crazy quilting. I would never put that quality of muslin to be visible in a quilt however. I have not checked JoAnn's for good quality muslin. They may have it but be very cautious. Good quality muslin, both bleached and unbleached, can certainly be used for quilting and has been for years. I really like Kona solids so if I could wait for an order to come (by buying on line if you don't have another fabric store option) that's the route I would go when looking for white fabric.