[slededit]

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...

[bigiain]

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...