Not sure yet... Asked Stu to find me one... The discussion went something like this:
ME: "All the diffusers out there suck. The brand name ones are ridiculously priced and I don't like most of them. The eBay ones are all questionable quality and they're stupidly priced too. Can you find me a decent one at a decent price?"
A day or so later he told me he'd found and ordered one. That was a month or so ago. (They had to fabricate it after he ordered it.)
It arrived at Advan today and hopefully it's already on its way to me..
Now you know as much as I do... I'll report more once I've got it...