Edit: just for fun (and actual neighbor of China), tried Ebay India too, seems not-impossible: https://www.ebay.com/sch/i.html?_nkw=blackwell+gpu&_sacat=0&...
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Eh, you'd have to cross the Himalayas and go through what is kind of a military zone.
Kazakhstan and Vietnam are more suitable candidates, but neither has actually good infrastructure connectivity to China.
