A lot of this is old world vs. new world culture in general. Even South of the border, where cultures have been more preserved, there are more shops and carts and little family businesses where this stuff is an option which exists almost nowhere in America now.
Yes, and, in the case of a place like Vietnam, corporate goods are openly counterfeited so they become something available at small shops. This is true with clothes, books, music, etc. In the larger business models, sellers don’t have agency over their selling prices. They’re reduced to mere middlemen.