For starters, there is no Walmart here, nor is ammunition legally obtainable as far as I know.

Which country are you in? I wasn't aware that any non-authoritarian countries had complete bans on all types of ammunition.

What do you need ammunition for when you aren't allowed to have weapons?

Besides, what non-authoritarian country considers cryptography to be ammunition?

Edit: Looked it up, if you got a license (for either hunting or a shooting club) you can legally have and buy weapons and munition.

Not true. Bullets are really controlled.

Varies from state to state and even county to county. In NYC and many other places, if you're caught with bullets for a gun you aren't permitted to possess, you can be charged with felony possession of ammunition. This is particularly used against those with prior arrests and/or convictions on their record.

But, you know... I am not a lawyer.

This is only true for a few states, I'm not aware of even some of the worst like Massachusetts doing the same (e.g. there getting expended .22 LR brass stuck in the sole of your sandal is a crime punished by a mandatory one year in jail). As I recall, NY state, forget the city, makes it illegal for your spouse to use one of your handguns.

Most states, assume 40+, and most of the population, say, 2/3rds+, don't live under such insane restrictions. Looking at the top states by population, California is #1, in the middle of the 8 worst for gun owners, and I'm pretty sure doesn't do this. Don't remember Illinois doing it either. New Jersey, maybe.

To finish, the Feds allow ammo by mail order, the only restriction is the usual "Stick an ORD-M label on the package" and ship by ground. That's about as unregulated as you can get except for the usual age limit.