I dont even remember when My last coils were changed.
But here is the run down
Kay, your setup----lets say total 70$ (including the glass tank) coils... a pack of 5...going to last you... 2 months.
then new ones.
What I did is I went on the internet (Fasttech) and bought a cheap clone tube mod and RDA. (24$ And 14=38$)
Then I went on Amazon and bought a decent charger 25$
then I bought a couple decent batteries 30$ (15 each)
Then As I waited to get it i read and reread baditudes blog About the safety (mostly about battery safety) Which are found herehttp://www.e-cigarette-forum.com/forum/blogs/baditude/
Then I got some cotton (3$) and 10 meters of coil (5$)
total 101$ to get started
of course after that, i just went crazy and spent hundreds on new mods and new mods and new mods.
and now I am pretty much settled.... on regulated,
which would have cost me about 150 to get started with.... but...
ADVANCED vaping could be big initial start up cost and cheaper after
or... Vaping could be... smaller start up... and continued cost, still cheaper than cigarettes, but more in the long run than advanced gear.
of course you could get shinyitis, and dig your credit card in to a hole that you are just now starting to claw your way out of the depths of.