I really only buy online when it's on sale. I can pretty much always run up the road to Fabric Depot, one of the biggest fabric stores in the country. And they have sales and 35% off coupons, and if I go in the other direction there is a Joann Superstore with lots of coupons
Honestly, as long as it's all quilt store quality 100% cotton I'm not too concerned if the feel of the fabrics are slightly different. I've used the Cotton Couture with other brands and don't think it made a difference in the end quilt.