I've got the Natural now, which after modding a bit is absolutely lovely. But I'm wondering what's out there for a single 18350 that's SMALL. It seems with the Natural there's a fair bit of wasted space with the switch housing. I don't particularly care where the button is, I can adapt. I don't care if it's a "knock off", as there are only so many ways to design a tube with a battery inside. I just want something SMALL that doesn't take up too much real estate in my pocket. Less than $100 would be preferable. What's out there?