1MioFlight-- while you are right about La Cumbre not being Buenos Aires, there are surely "Casas de Cambio" or "Financieras" that will be able to help you with cashing a cheque... it will be an issue of knowing the right people and finding someone thats trustworthy. Else, you may have to go to Cordoba Capital.... Im afraid my financial city contacts are all in Buenos Aires, so I cant be of much further assistance.