does the bitcoin become cheaper if you buy from a country with a low currency value?
No, the value is same everywhere.
But if you buy from a person who needs money quickly and is in an unstable country, where selling could be slow or difficult. Then yes.
Not technically true, there are some regional differences. South Korea is renowned for having much higher costs than elsewhere in the world. But yes, for the most part the differences are negligible and only really in place when those countries have strict regulations that stop many people from being able to buy on their markets.
