Hi guys and gals, I am looking for the lowest operating cost on a tank. It doesn't have to have come out this year, but I am looking for the tank with the cheapest coils. I just bought an anyvape Davide tank for $5 because I had a pack of Aspire BVC coils lying around, but I am looking for a tank that takes really cheap coils because my vape budget is under $25/mo. I don't want the Ego AIO again although I know the coils are cheap. I was looking into the Anyvape Furytank or the Tobeco Supertank Mini because they take Aspire Atlantis coils, but would a Bajiada Mermaid plus some Herakles coils make more sense? Let me know what you think.