Costa Rica money is Colon. Our currency fluctuates from Monday to Friday.
The average exchange rate goes from ¢530.00 to ¢536.00 per USD$1.00 but it can vary depending on demand.
TIP: If you do the exchange at the airport, the bank will pay lower rate so, is better to get Colones at the banks in the towns or directly from the ATM machines.
Source: ExchangeRates.org.uk