There are also a number of commemorative coins in circulation. There are severe penalties for changing money on the black market. Check with your credit, or debit, card company for merchant acceptability and other services which may be available. These are generally not recommended but should be in a major currency.
Exchange rates are liable to change significantly and rapidly.
There is a black market with a premium of around 5000 per cent over the official rate. The import and export of local currency is prohibited. The import and export of foreign currency is unlimited, subject to declaration.