I personally use a vtube (lavatube) variable voltage
device. I used to own a provari but I found the vtube to perform just as well for a fraction of the price so I sold the provari.
With the vtube I just use boge cartomizers and a few
tanks. apolloecigs has a vtube kit for 59.99. It comes with the device a charger a 18650 battery an atomizer and drip tip. Great sold device for the price in my opinion.
As for my cartomizers I will buy them from a couple different places. vaporkings, madvapes, and gotvapes