I've once paid 40€ for a wire transfer from Germany to the UK because I was stupid enough to pay in pounds instead of Euros. The goods I paid for were worth 40€

I've once paid 40€ for a wire transfer from Germany to the UK because I was stupid enough to pay in pounds instead of Euros. The goods I paid for were worth 40€. So this is also a problem outside of the US. It very much depends on your bank, too.