Just a tip. A fabric shop owner said that the Wal-Mart is the low grade fabric(before they start tweaking and making upgrades to it). The material for JoAnns, Hancocks, etc are the second grade(before the final tweak). The fabric for Quilting shops is the top or the best grade. Does make sense. My vote is to use what you want or can afford. Quilting can be very expensive and corners need to be cut when necessary.
HAPPY HALLOWEEN!!!!!!!!!!!!!