Unfortunately, some stores just have a better selection of things than others. For sure check your local bakery supply shops and craft stores, too! I was looking around at bakeries since my little girl's birthday is coming up, and I couldn't believe the number of bakeries that also sold supplies. Oh, and you know what, I don't know if you have one or if they even still exist, but Watson's used to have a small bakery section with flavors (it was a department store) and some of the other dept. stores sometimes sell bakery supplies. Don't ask me why lol.
Edit: I just looked online and you should check Sears, too!