Czech crown (ceska koruna) is divided into 100 hellers                       (haler), you can see signs of Kc (czech crown) and h (heller).
Coins have values of 10, 20 and 50 h; 1, 2, 5, 10, 20 and 50 Kc.
Banknotes have values of 20, 50, 100, 200, 500, 1000,
2000 and 5000 Kc.

You  can exchange you money in many banks, change places. But                      do not change you money on the "black market", simply "one                       hand to another". You will not have any guarantee of the fact                       the money are valid.

Credit Cards-- Visa, Master Card, American Express are accepted, links to  MasterCard - Cirrus ATM Locations and Visa - Plus ATM Locations