Fuck all these. Make your own vape. Just craft a heating element, (maybe even a stainless steel spoon rigged up to an electric heater) and you could even make a fancy self filling bag like the volcano by taking an air mattress pump (little electric fan that fills up air mattresses) and attaching a hose to the output nozzle which leads to a plastic bread bag.

of course this would be very crude but you could essentially build something for a fraction of the cost and come out with a unique personal vape.