yup, shit can get real expensive real quick
you've made the initial investment tho, which is the biggest one... now the best method to find juice / coils is researching & buying online (usually from fasttech.com for coils) >> There are so many juice sites out there. Best bet is to try and hit deals/sales from different ones.
reddit.com/r/canadian_ecigarette (cuz of how trash the CAD$ is)