There are many Electron Microscopes. Electron Microscopy can be described as a wide field. There are three types of scanning electron microscopes: Tungsten, LaB6 or Field Emission, and Transmission Electron Microscopes. They can also have sub-types like High Resolution TEM, Cryo-TEM, Dual Beam Electron Microscopes, and Focussed Ion Beam Electron Microscopes.
SEMs are the most popular of all these. They also have two categories: Table Top SEMs or Conventional SEMs. Prices will vary depending on your application and final configuration. There are many detectors, resolutions and options that you may need. It all depends on the application.
Table Top SEMs will cost between 50,000 and 70,000 USD, while Conventional SEMs (TungstenSource) could cost from 80,000 to 120,000 USD.
Prices can vary widely from one country to the next.