[gus_massa]

Here in Argentina we unofficially deprecate the coins/bills when they are worth approximately US$0.03 [1]. Now US$1=AR$1100 and you can find in the wild AR$100 and some AR$50, but AR$20 are very rare, AR$10 almost imposible to find, and lower denomination are just museum pieces.

Theoretically you can go to the supermarket with a big bag with a thousand of AR$1 coins, and they must accept them but it would be very weird.

[1] It's a personal opinion, there are no official threshold, don't ask how I made an statistic.