I actually have one, in the next town over. It's almost within walking distance. (I have walked to the near side of that town to have the car repaired several times. But this shop is on the far side.) It didn't stock cedar #mothballs either. An amazing selection of screws and nails and nuts and washers. No mothballs.
About my only source was dodgy importers with Chinese business addresses on e-Bay, and I wasn't going with that. I'd given up with the death of Wilko.