I know you can get a 510 tank, but have there been any discussions in carrying 510 cartos/attys? I know about 99% of everything else(not Vapor4Life) is 510. I have friends who had wanted to order things from Vapor4Life but cannot as they need 510 connections. They could always use an adapter, but they dont approve of adapters.
I also have other devices that are 510 threaded. I am using my Vapor4Life tanks with cartos I purchased elsewhere. I just dont like dealing with other people as Vapor4Life has always been good to me.