Also, you'll see little exchange booths by the roadside all over the place. They can be handy if you run a little short and need to change a bit, but count your money carefully, and beware of any places where the posted rates seem too good to be true: they are. If you're lucky, they'll just raise the rate through some bogus commissions etc; if not, you'll get the posted rate, only minus a few bills spirited away through sleight of hand.