If you feel up for it, you can always buy some cotton balls, kanthal and a rebuildable tank (kayfun, russian 91%) and wrap your won coils. My coils generally last weeks, with my switching out fresh cotton wicks every week or so. It takes a few tries to get the right wrap, but once you do, none of the other tanks can compare to flavor or cloud production.
I have been doing that since Feb and I think I have spent all of $20 (initial investment) and no need to buy new heads or anything like that. $20 for what will probably be about a years worth of supplies is a pretty good deal if you ask me.
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