According to the terms and conditions page of the Western Union Prepaid Card it appears that there is a 1% foreign transaction fee. Here is exactly what they say:
"If you obtain your funds in a currency or country other than the currency or country in which your Card was issued, we may increase the currency conversion rate up to an additional 1% and will retain this amount as compensation for its services."
Also please do not forget to call them ahead of time and let them know of your travel plans. Otherwise, your prepaid card might get declined since Western Union will not know if it is legitimate charge.
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