Oh but they do. Advancedvapesupply.com. They specialize in ss316 and other ss wires. Check'em out. Oddly enough simple ss316L 24g w/3mm diammeter has been my go to for rda's
I'm super stuck on 3-core (fused) alien builds for flavor. I can't seem to build anything that'll top what I get from this build (but I'm always looking!). I usually ohm out (dual) at 0.16 ohms, and vape at 100w (I target 4v and 20amps max, so if the ohms move I reset to 4v as a starting point). This is hot enough that my coils don't gunk up but not too hot (YMMV).
About SS316: I've noticed that SS seems to bring sweetness WAY out front, so if I build with SS I bring my sucralose (if I'm using any) down from 1% to ~0.5% or less. Anyone else seen that effect?
I've kind of quit building with SS and gone back to ni80 (wraps) and Kanthal (cores), not because of the flavor change (which I liked - less sweetener is always a good thing IMHO), but because it was too hard to get my builds to have high enough resistance to work well with my mods. TC sucks, IMHO, and these builds were coming in so low they'd only work on TC settings.
ANYWAY... yeah lots of companies are offering advanced builds for sale now. I think it's really cool. Geek Vape, JonesnBuilds, lots of others! If you take good care of them they'll last for months, and worth every penny (esp if you don't want to learn to DIY).