Where can I exchange quetzales to dollars?

I'm curious, where exactly can one find a reliable and efficient way to exchange quetzales to dollars? Are there any specific exchanges or financial institutions that cater specifically to this type of currency conversion? It would be helpful to know if there are any fees associated with the exchange process and if there are any limitations or restrictions that need to be considered. Additionally, is it possible to conduct this exchange online or does it require a physical visit to a bank or exchange office?