A Muggle product, Sirius? I use self-sticking plasters nearly every day.

Now I think of it, I have had one or two students express surprise as though they've never seen them before. Did your family not ever purchase plasters? I suppose the magical sort might have derived from a Muggle idea, though I hadn't considered that before. Hm.

In any case, I believe you'd find that they'd sell very well if Remus were to stock them. You wouldn't need to import them, either. I'm able to purchase them from my domestic supplier.