A year ago I paid US$300 for a round-trip ticket to El Calafate. LAN Argentina's reservations clerk told me to book the flight with my DNI, to get a better price.
A month later two American friends took the exact same flight and were charged US$ 600 apiece - twice what I paid.
A month later two American friends took the exact same flight and were charged US$ 600 apiece - twice what I paid.