You have to read Boveda's website as it's based on the number of cigars you have. I recommend 65rh bags and I use a lot of them in each of my coolers. They'll work easier and last longer that way.
They're not expensive and adding a couple extras, they'll last for years.
1) keep your good cubans away from your field bought ones, possible the field bought ones might have beetles, so a good idea to keep them separate.
2) Magic number rh wise for cubans is 63-65%, personally I store at 65, 69/70 is outdated and too high
3) You really want the 60g 65rh boveda's, these specifically https://www.amazon.co.uk/Boveda-2-Way-Humidity-Control-12-pack/dp/B00CPPG228/ref=sr_1_8?dchild=1&keywords=65rh+boveda&qid=1587575801&sr=8-8
You can usually buy these as singles or 3 packs, but I can't see any on amazon right now
4) For storage, the best honestly are good airtight tupperware containers, I use lock n lock, they come in various sizes, you may need to check the measurements to make sure they fit, but something like this would be good
Exactly. I have ten or so in each of my 72qt. containers and they've been lasting for years. OP, buy this and add to your container and you''ll be good.
OP asked WHERE? … there are many places to buy Boveda packs: the local head shop, the local B&M cigar shop, most online cigar retailers, my usual go-to: Amazon
Based on my current consumption that pack would probably last me 5+ years.
amazon seem to be selling 12 packs at the moment
We could go 50/50 if you want? I need some new packs as well.