Figuring out a reliable, smart, cheap stockpile for me has become part of the hobby. I picked 10 years for psychological reasons. I don't want this to become neurotic.
Phase 1. 3 liters of nic should last me 11.5 years ($160 including shipping and amber glass for the freezer). I could vape the SV rda clone from fasttech for the rest of my days so 5 of those ($46). I like the Pico so 5 of those ($130 from FT). Atomizers, mods, and nic are the essentials and I've covered it for--$336. Because they are literally dollar store items I'll have enough redundant o-rings, drip tips, rebuilding tools and wire to go the distance, can't be more than $50-75 for several of everything, like Noah's Ark.
Then I'll procrastinate and see how things develop with the gangsters in Washington. May be the courts will give us an injunction that delays the rules so there will be lots more time. If things get really grim I'll try to do phase 2 which is redundancy in the form of another batch of nic from a different supplier, 5 more mods from a different manufacturer in case there are shelf life problems with the Picos. I'd pick 5 vtc minis if I had to decide right now. Then 5 more SV rda's because I really do like them, what the hell. Now my chances of lasting 10 years are looking pretty good and may be a lot more and I'm still far from spending $1,000.
I got one of my brothers vaping and he's not responding very well to the stockpile idea so far but I won't freeze him out no matter what so may be Phase 2 will get more priority so I can cover him (and never let him hear the end of it).