A satellite cost is related to its size, its function, and the technology included in it. It may cost from USD 10 million for a very small a simple use satellite, up to USD 400 million for a big, heavy, and complex satellite.
If you want to know more, please go here. This data was sourced from the book Transportation and the Belt and Road Initiative, in which more data as well as the original primary sources of the data are available.