I've found that any store I go to has some wonderful fabrics and also some I would rather not use.
Naturally I prefer the lowest price on anything, and sometimes that may mean lower quality as well, but not always. I've found really nice fabrics that were less expensive than ones that were questionable.
So for me it's a case of feel it and then decide - no matter where I'm shopping. And also explains why I do very little fabric shopping online.