Ecuador
Ecuador has some of the most expensive bikes in South America, but the little 125's are about same price as the other countries - just the bigger bikes are high.
i don't think you can sell an Ecuador bike in Argentina, unless you go over to Paraguay. Dakar motors in BA might be able to help, and do more searching here.
Best bet is to search here for a traveller's bike for sale in Ecuador, then sell to another traveller in Argentina.
Zig
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