Kobo is easy; just click on the flag and change it. Amazon can be more problematic, in that sometimes even if you're on a different national site they're showing the availability and price in your own translated currency. In both situations, just looking from an incognito or private window can help get unalloyed results.
ETA: If you hit a snag, someone in the country will be happy to help. I have to say that it seems your nomination isn't available in the US.
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