Coin

Hiiii! I am big fan of adventure time, how can I buy this coin?🙏🏻

We have no idea what item you are talking about, and anyway there is no buying or selling on Numista. Check ebay!

The only item I found is a crushed coin. So you will have to find said coin crusher and hope that it still exists so you can destroy your own money to create it. With the host coin being a US cent I would start my search in the USA.

https://pennypresses.net/home/map.php

Also, you don't have to use a penny, you can use any similar sized token/piece of metal.  Or the machine might provide the penny or planchet itself.

BramVB

We have no idea what item you are talking about, and anyway there is no buying or selling on Numista. Check ebay!

Probably N#357749

Per this Reddit thread (from 2018 mind you).  It's in a Mall in New Orleans.

https://www.reddit.com/r/adventuretime/comments/1mmmugp/best_51_cents_i_spent_in_2018/