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They go for about $10k-$30k on EBay. But people have also DIY'd their own: http://makezine.com/2011/03/24/diy-scanning-electron-microsc...



Or free - if you're in the right place at the right time (and have the right reputation and friends...):

https://tinkerings.org/2015/11/15/in-which-i-acquire-a-scann...




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