I don't live in Europe, but it seems to me that "euros" is correct however since I've heard so many non-native English speakers say "euro" as the plural, it doe

I don't live in Europe, but it seems to me that "euros" is correct however since I've heard so many non-native English speakers say "euro" as the plural, it doesn't sound that odd to me anymore. For abstract sums ("that will cost many euros") I think "euro" sounds outright wrong though. In Serbian, they are pluralised like a normal noun ("jedan euro" "pet evra").