Our expert says:
Honestly, I don't know. I can't help on this one. I would have suggested the places you've already been to, and so if they don't have it, then I really am stumped. Perhaps an internet search would help, though even that is more global and not limited to SA. Hopefully someone on the forum can help, I'm afraid I can't.
Using the lighter ones is not the end of the world, though, so if all else fails, use those.
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