Really good thread start PKv.
You know there was a lot of despair out there when the supply of ammo and then the price shot up to add insult to injury. I suggested that folks focus should change to barter items.
Good friends our ours do not smoke however, when you go into their basement they have vacuum sealed, oh Lord, a shitton of cartons of cigs. Maybe as much as 50-cartons or so. The cartons are a mix but mostly generic cigs that they buy when they go on sale at a local "smoke shop".
Batteries like you write PKv, are another great item to prep with. Now while the standard sizes of AA, AAA, C, and D are good to collect, do not forget those flat disk batteries used for hearing aides, CR123, 9-volt (Just think when that dang smoke alarm will not shut up), EoTech type optics, etc. will be worth a mint if there is a shortage.
Remember, if you need a new saw blade for your circular saw, buy two. If you buy a new oil filter for your tractor, buy 2. If you need a pound of star screws, buy double.
Lets keep this thread rolling.