Q: Amazon instant video app

Hey AIC3285,

Purchases may only be made through the App Store for the location that you are currently residing in. See this article for reference -

Change the country of your iTunes Store, App Store, iBooks Store, and Mac App Store account - Apple Support

Specifically -

When you make a purchase from the iTunes Store, App Store, iBooks Store, or Mac App Store, you must use the store that matches the country where you're located.

Thanks for using Apple Support Communities.

Happy computing,

Brett L