At most LQS's there are "bundles" of fabrics or look at a layer cake or charm pack. You get a variety of fabrics. Lot's of fun patterns out there for Charm Pacs.
I wouldn't spend my $'s on backing at a LQS unless it was for a very special quilt and I definetly wanted it to match something on the front.
Have fun. Hershey is on my "bucket" list to do before I hit one of "those" birthday that end in "0".