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I liked a russian hacker's story of building an IR camera by repurposing an old scanner: at one point he tries to source a detector from China but is unable to order it because of (he says) US export rules; then he remembers he's from a country that builds its own air-to-air missiles, and finds a Russian supplier who sends him the part...

[thriftwy]

I believe the rationale here is that if you can source some gadget from China, it's going to be ten times cheaper than any alternative, since there's an enormous stock of those there used to to make other gadgets, therefore low margins and high turnover.

So that's where you look first.