That’s a good question as I’ve always wondered this too. I’m pretty sure only the scented and unscented versions are available in the States though. I’ve also seen they have an aromatic Dark Plug as well as the scented Dark Plug across the pond.
Thanks Paul, you’re probably right, it’s probably just a geographical thing. I could have sworn I’ve seen both offered somewhere before though, could be wrong, don’t have the best memory.