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Make sure that you go to right booth upstairs. There are now 2. A square BAC bank booth that pays bank rates or a roundish currency exchange that pays rip-off rates to buy and sell dollars. Looks like global currency exchange has opened a booth upstairs too now (to rip-off the unknowing gringos again on the way out to buy back dollars, just like the way in). The rip-off booth is located on the left side as you walk into the departure terminal. The BAC bank (square red booth) is on the far right side as you walk into the departures terminal.