fabric.com has a good assortment of muslins, their 'premium bleached muslin' is very nice- i'm using it now for background blocks for an appliqued quilt- and they have free shipping at the $35 mark---I can always find enough fabrics/thread/batting/ what ever on their site to meet that- they have a good selection/variety and prices...I've been shopping with them for way over 10 years.