FH3 Expansion pass on amazon?

Hi, since i live in Argentina, the prices or the store are 2 or 3 times higher than the us store.

So what i did is change my pc region to US, and bought the fh3 digital code on amazon and redeemed it.

Now i want to do the same with the expansion pass, but i didn't saw it on amazon to buy the digital code, can i buy it somewhere else?

What would happen if i want to buy the expansion pass in my country's store? That wouldn't right? Since the game is from the 'US' and the expasion pass would be from Argentina.