Went to Joann's Fabric today for the Black Friday sales. There was a coupon for both today and Saturday for 50% off any one item in the paper! If you have a Joann's near by, this is a great chance to get some muslin for cheap! I'm not sure if this is a national sale or if it was just in Fresno, CA, but might be worth checking out. I got a 108" x 18' bleached muslin, permanent press, for $15! I'm sure it'd be cheaper if you can find a bulk roll as well.