thanks for the info guys! i've asked around and was able to reserve an airtic that returns a day before.
sure, i'd like to keep my vacation, but i'm not so inclined to spend 2300peso just to spend 2 days watching glaciers alone. i'm not much of a solo traveller. perhaps paraguay could be a gd alternative, not sure about montevideo but colonia is supposedly a ferry away and quite a quick day trip.