Ray, by far the best deal is to use an ATM machine in the airport. The "money changers" are pretty bad, at least three if not closer to 5%. I used to order currency before leaving states (BofA) but switched to ATM when I found out how cheap they are. With BofA, I would pay $5 fee and then get midmarket rates. Now, with Fidelity, I pay no fees and still get midmarket rates.
There are always ATMs at airports.