I picked up all my maps of S. America at Barnes and Noble...with the exception of Colombia. They couldn't even order a Colombian map??? Prices were cheaper than anything I could get online (shipping versus local sales tax). The maps I liked were made by Borch. Laminated 1:4,000,000 scale. ($12.50 US/map out the door [i.e. including tax])
I think a combination of Maps and GPS is best. I learned my lesson in an earlier trip this year. I was using only GPS and found that many roads ran out on me. I ended up going cross country through an open pit coal mine! It was fun in retrospect, but put me back a few hours.
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