I completely agree with the points liste so far, but to add my 2 cents as well:
I've been to some fabric shops that sell "quilting fabric" and it's not 100% Cotton but 100% Polyester instead. So I always ask and read to make sure I am getting what I intended. Usually Quilting Fabric as a reference is a matter primarily of thread count and fabric quality, but can also mean other things in some stores, so be sure to ask ;) and that's really the bottomline. You wouldn't want to risk making a big impulse purchase because of a good sale, and in the end wind up disappointed.
Explosive blessings, abundance and inspiration to you all!
- The Creative Seamstress