my bvcs last easily 1 month, how you blowing through one everyday? lols and i am an heavy heavy vapor, easily blow through 10mls a day
if you can do wattage setting, set it to 7watts and try vaping with that and see how long you last
lower the amount you consume from 15 ml to 8ml
the cheapest route, although it is an expensive upfront cost but long term cost it is much much cheaper, maybe have to blow 200-400 in one shot
is to get an rebuildable tank atomizer mod such as kayfun lite clone, ehpro big buddha, aqua, taifun etc... (look up which one you like) where you can rebuild your own coils
then buy your own pg vg from essential depot, 2 gallons for $50, free shipping
then buy vaperstek nicotine for $35 (120ml i believe), pg easier to work with, vg a little harder, more thick
then buy your own juices from places such as flavorwest, get a bunch of flavors at 4oz, if you like it that much get them in 8 or 16oz but it will take u a long time to finish, so start with the 4oz, maybe you dont like the flavors, probably $100
then buy your lab equipments from liquid barn, graduated cylinders, boston rounds, funnel, etc.. probably another $60
then buy your rebuildable equipments from amazon (dewalt 21 piece drill bit, scotch scissors, hakko wire cutter, butane fuel, ceramic tweezers, mini screw driver set, temco kanthal wire 28 gauge) this will set you back around $100
then lightning vapes (torch, ohm meter, volt meter if you using mechanical) for around $40
then ebay for some japanese organic cotton for around $10
an investment like this you will be able to vape literally cost free for the next 2 years, but be prepared to drop 200-400
i might be missing an item or two that i cant think on top of my head but thats what i use and it working great