Costume stores in North Dallas

Every year about this time they mysteriously appear in our neighborhood, randomly popping up in vacant storefronts. Then, almost as quickly as they appeared, they're gone.
I'm talking about those fly-by-night Halloween costume stores that open for about a month every year. But because they're housed in vacant stores, the location of these shops changes from year-to-year, making them sometimes hard to find.
I've been keeping a scope out for them this year, and I've spotted several here in our neighborhood. I know there's a Spirit store off Belt Line in Addison where the Thomasville store used to be. And there's another in Richardson off Coit.
This weekend I went to the Halloween USA off Campbell in Richardson and I was really pleased with their selection and prices. If you or the kids still aren't sure what you want to be this year, this is a great place to do some browsing and brainstorming. There are two other Halloween USA stores in our neighborhood: one off Preston near Valley View mall, and another on Dallas Parkway closer to the Galleria.
If there are any others out there that you know of that I don't have on my radar,  let me know so I can add it to the list.