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After your friend arrives, go outside, cross the street, up the stairs to the departure terminal. Go inside and turn right. All the way to the end there is a bank that has very good exchange rates. If either of you fly in on Spirit, you can also pay your exit tax just before you get to the bank. I think all other airlines have the exit tax in the ticket price.
The bank has moved. They are clearing out that area, the exit tax place is down to 2 windows since almost all airlines include it now. The bank is now to the left as you enter the terminal, it's on the left hand side, just before you get to the security lines. I got 550colones-1usd there on Saturday.