Not a clue! But I can tell how not to save any money with vaping and possibly spend more than when you were smoking
Provari, Legacy, Saber Touch,Siam Cobra,Ikarus, Poldiac,Diamante,Joker,69 Mod,Max Woodie, Big Daddy Meter Box,VV Altoids, VVSplash , Wizard, IHybrid,Vapor woods,Bliss,GP Spheroid, Gepettos box mod,EA Mod,ZAP, SS Avenger,Opus,MCM DNA 20,Orion,GGTS,ODY,UFS,Ithaka,Wand,Roller,Steam Machine,Somnium,GUS TS,KAYFUN, NZionic,Gamma, Steamboy, ELA,Semovar,Morph 2, Nemesis VW, CHI_YOU, King, Aero,M16,Aqua
It's not a big deal. People will be curious no matter what you use. You are still sucking on something attached to a metal tube. I've used mine in front of cops and they don't even blink. I carry a 3ml bottle for refills that has a vendor label on it just in case I have to show proof of what I'm doing. Ecigs are mainstream now that stores are carrying them and people know what they are.
I have eGo for backup, but I like vaping all day on one 18650 IMR battery. With the smaller ecigs people know that it's not a cigarette, anyway. They can tell by the lack of smell and the fact that real cigs don't light up with an LED on the end.