Car / Van help BA 4X4

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Van / Car wanted Feb 2017 in Buenos Aires

HELP needed in Buenos Aires!!!
My family and I are planning a trip to South America next year February 2017, starting off in Buenos Aires Argentina.
We want to buy a van, 4x4 or SUV in Buenos Aires and then drive around the continent. Do you have a vehicle for sale? 
Does anyone know how much we'd have to spend on a decent/Okay second hand vehicle? And if it's easy to buy one in B.A.?