I remember Peru as cheaper than Chile, with a pretty good selection in the two towns where I bought tires--Cuzco and Ica. Labor's cheaper, too.
I guess you and I see rear tires differently. If 4000 km/2400 miles is half the tire's lifespan, then it would indeed be silly to toss it now. But now that I've given up on TKC's, all my tires last far longer. YMMV.
I'd carry sprockets regardless, since they're bike-specific, therefore the most difficult to source in faraway lands. The rest is up to your tolerance for heavy loads and (eventual) shopping trips in strange cities. But if you're picky about tires, there's still a strong case to be made for buying when the opportunity arises rather than hoping you'll turn something up a couple of thousand clicks down the road.
I'll be interested to hear how it goes for you. Good luck!
Mark
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