I worked upon restarting and improving an existing driver for Final Fanhtasy VII and Final Fantasy VIII on PC, which fixes ton of bugs and improves modding capabilities by making them look better and load faster :)
The project is fully FOSS and licensed with GPLv3 ( inherited from the original author ).
Pricing in the list can be implemented with a static dictionary in Javascript being served with the HTML on page load. It's not optimal at all ( as well as it returns 429 at the moment, for me ) to call an API to just get back a single price per country.
Another option you may think is a global refresh button which reloads this dictionary. But the lookup should be immediate.