Tire prices vary greatly from one country to the next throughout South America. Buy where they're cheap....which means NOT in Brazil, French Guiana, Chile, or possibly Argentina if you can't pay in hard currency. Peru was cheap enough, as was Colombia. Paraguay has almost everything available cheap, although it all seems to be smuggled.
Or: just buy tires wherever you need them. What's the difference, really? I choked at the price I paid in Brazil, but it's now five years later and it's made absolutely no difference to the way I lead my life. That must mean something.
Whatever you do, don't carry tires all the way from the US. That's just silly. And stop listening to whoever told you they'd cost hundreds of dollars apiece in "South America." That'll be true only in certain countries (per above).
Hope that's helpful.
Mark
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