Thanks for the suggestion. I've been using Western Union to pay my rent in Panama, and the fee is a flat $8 for my $700 transfer. I could just pull the amount from my no-fee ATM card, as everyone here operates in cash, but I prefer to have a record of the payment in case of any disputes. I'm guessing the fees would be higher if an exchange rate was in play, but as Panama is on the USD, there's just the transaction charge. I will have to check out TransferWise to see if it would be a better option for me.