If I am buying on line I buy from a vender I am familiar with. I have only had 2 bad cuts when I went to 2 venders I had not use earlier. I check for feel and smell when buying for LQS or JAF. I have only purchased 1x from Holly Lobby and the quality was "Okay". A little better than craft quality, ok for dress making but not quite what I want for a quilt.
It take a bit of a while to get the "feel" for quilt quality fabrics. One fun thing is have a shopping day with a quilting buddy and check things out.