Download a currency conversion app.
When I go to buy a keepsake from another country, I’m always wondering whether it’s a decent price or not. Of course, different currencies have different values (if that makes sense), but I don’t want to end up spending all of my money on one item. So before we go anywhere, we make sure we have a currency conversion app downloaded, especially one that doesn’t require an internet connection.
There are many available, personally I always use XE (available as an online site or an app).
This way you can check how much you’re spending immediately rather than missing out on an item because you’re unsure of the cost OR spending all of your money on that one item because you don’t know the conversion.