I do support the LQS, but I find it hard to pay double for the SAME fabric. Our Joann's is carrying Kona Cotton Solids and Kona wide bleached muslin. They also have high thread-count Egyptian cotton solids, that are nice. If I use my % off coupon that takes it below half of the LQS. I have to watch the quilting budget, and the most yards for the least $ is my goal.
As far as quality; I am critical of all of the fabrics I buy, no matter how much I pay for them. If they don't look and feel right, I don't care what a bargain they are, they won't go in to a quilt.
Happy fabric hunting & don't forget to check the sale shelves!