Definetely don´t buy money on the street at the dealer. If you need to use the services of currency exchange, we recommend you be circumspect with its selection. The biggest density of Money Exchange is in the city center. Offers of some of them looks very conveniently, but they can be at the end more expensive. Somethimes is offered rate valid only when you are replacing a larger amount of money! If you are changing only a small amount, the course is completely different. It is better to always ask before what the rate actually is. Relatively unfavorable currency exchange rate are at airports. So if you need quickly Czech currency, the best way is to choose the amount of money at an ATM where you can get a decent rate. The ATM network is very dense in Prague. You can trust any bank.