https://www.nytimes.com/2023/04/17/realestate/japan-empty-ho... https://archive.is/BDCnm
But these are traditional Japanese houses so quite a lot of renovation is needed to bring it up to a Westerner's standards. Still, all in all, if you are fine with living in a backwater village with barely any modern conveniences then 200-300k for a big house is not too bad.
Assuming you can speak Japanese and don't mind the xenophobia...