In the early months I bought a couple of tanks and regulated mods from a local vape shop and e liquid in 240 ml bottles from itcvapes. Last summer I migrated to rda's, temp control mods, and DIY liquid. That suff came from Fasttech and myfreedomsmokes including a 10-12 rda's, 3 TC mods, several liters of 100 mg nic, and mixing supplies, about $1,200 over 16 months. To have 10 years of self sufficiency with a comfortable margin I need a couple more TC mods, a bit more nic, and.may be a couple more clone rda's. After that I'll only NEED to resupply PG, VG and batteries and I'll only want to buy a new mod or rda when there is a real advancement that interests me.