Highly recommend using MoneyGram in lieu of WU. If you use a U.S. debit card to send to a virtual wallet, there's no fee, and then you can just transfer the money to your Argentine bank account if you need paper bills. Sure, there's an extra step of a transfer after the first transfer, but I find that the rate has consistently been better than WU for about the last 5 months (as long as I've been using MoneyGram) and it's great not ever having to pay a transfer fee of USD$30. Even the fee for charging the transfer to a a U.S. credit card is less than the typical WU fee. Plus, the ARS deposit always comes through to my MercadoPago account within an hour or so after confirming the transfer.