Hello Adam, welcome to POTV mate.
Congrats on quitting the stinkies Adam...the months will soon fall by. I'm a relatively new vaper myself and haven't got around to the rebuildable stage yet, and for now, happy to stick with stock coils. I've found that the cost of replacement coils isn't that bad, depending on where you get them from. There's plenty of vendors in here, you may find better deals to be had, plus some of the vendors offer discounts if you use the POTV codes available in this forum. Also, the life span of stock coils can vary significantly too. I use Aspire Nautilus coils for my Naut mini tanks, and at the moment i seem to be burning through these every few days, i haven't yet worked why, so these are getting expensive to keep replacing. But the flip side is also DLT vis a Uwell Crown SE tank, and the coils can and do last for months! Seriously, i'm only on my 3rd one & i've been using this tank for nearly 9 months now, so relatively speaking, these are very cheap!
I suspect in time i'll also hop over into the rebuildable tanks too..but i hope you find all the advice you want in here.....loads of friendly folks that'll help you out.
Congrats again, and good luck with it...keep it up mate!