I know all the negatives concerning Walmart, but I have bought tons of fabric there and won't apoligize for it. I don't work, raised 3 kids, and Walmart afforded me the ability to sew and quilt.
One of my old quilt teachers said it was ok to buy fabric from Walmart for quilting but to hold it up to the light and if you could see the threads, don't buy it. If you couldn't see the threads then it was tightly woven and ok to use for quilting. I am hoping she is right!