I've found a ticket for 11,000 ARS but the travel agency needs to confirm the booking tomorrow, otherwise the next available flight is 13,000 ARS. I can get the flight for 11,000 ARS if I can find someone who will take the cash in USD or ARS for it, since using the blue rate is cheaper than paying in USD cash (1,500 USD v.s. 11,000 ARS).