If you're traveling abroad, you can often exchange money before you even leave the country. Contact your local bank to see which countries you can get currency for. Or if you are a AAA member, go to your local branch and see what countries they have currency for. They usually sell "tip packs" for various countries.
It's handy to have some local currency in your pocket when you step off the plane, because you may need it right away for things like taxis, bus fare, a quick bite to eat, etc.

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