Hobby Lobby is a good store to find some incredible fabric. Keep an eye out for their 40% coupons, whenever they're available is usually when I go to get a good stock on background fabric. Coupon is only good for the first cut, so you won't get 40% off your entire stash of fabric, so what I do is go in with the coupon, get the background fabric, get the 40% off and then I go back in to get the rest of my fabric. I'll be getting my sister's background fabric through HL, 40% off an entire bolt of Muslin, I might get out of there spending less than $20 for 20 yards of fabric. Coupon is good for online purchases, too, just have to watch when it's available.