You can Check Out for App Called pricing by country, you can set higher or lower product prices for different countries. and you can also sell a single product at multiple prices in multiple countries. To cover the free shipping to international customers you can add a shipping rate to the product price. Here is some feature
we can set price for different country with increasing percentage or amount.
you can set up local currency checkout
in build currency converter with lots feature
app is very fast
app work without any code in change in theme.
Here is link pricing by country & currency