This is one of those cases where the singular version would be a little better because it's not a product, it's a place that sells products.
You have to think that even if you were in a search engine and type "pet stores" for instance, to get a list of pet stores, the website you clicked on would more than likely be a pet store, not pet stores. If that makes any sense.
BTW, film is going the way of the dinosaurs. This domain would have a short shelf life.
Best of Luck