Originally Posted by Jane-Busty.pl

As for Prague:

- EXCHANGE POINTS. CAUTION! They will charge you a COMMISSION - up to 30%!

- Exchange rates they display large are sale rates, they sale euros/dollars at those rates.
But when they buy from You, they'll pay You scandalous rates.
ATM is the cheapest option.

- When You pay with a CC then choose the option "in your currency".
Don't let the seller convert to their conditions. Choose Your bank's conditions.

- Remember to NEVER do any transactions on the street. Cheaters will poke you offering a "great deal".
- Be aware of cheaters at ATMs trying to change 1000 CZK notes.

I'm telling You, Prague has become a mafia city.
They want to screw You everywhere. No joke.