I've got roughly 3 yrs' worth in the freezer (nicotine!). Not as worried about the continuing availability of PG/VG, since it's used for so many other things. If I was going to stockpile anything other than nicotine, it'd be mech mods (got 2), rebuildable attys, (4 kayfuns, 2 RDAs), and maybe WTA, though I'm in the process of slowly weaning off it, so I won't need it for much longer -- though I do plan to keep one bottle on hand, for "just in case", even after I'm no longer using it regularly. Such a better alternative than cigarettes, for the other alkaloids.
I still spend a little money on vaping; mainly on flavors, and the continuing acquisition of nicotine for the freezer, and new mods as my old ones get age on them, because I know full well that electronics have a very limited useful life, especially when well and thoroughly used.

But I'm not in a frenzy to try this and try that as I was at first, since I've arrived at very satisfying vaping and just have to maintain it. I'll probably grab another mech at some point; I love the kato, though I'd have to go with a clone, with my budget; it's got that "side pocket" as the VTR does, which I like, but unlike the VTR, the kato (and clones) can accept a 22mm tank.

But there are a lot of new models coming out all the time, so I'm kinda keeping my eyes peeled for one of those dual-18650 mech boxes, and maybe someone will make the kato's design with the dual bats and sidepocket for the tank.
Andria