It will depend on the type of adoption you choose.
For example, adopting a child from Foster Care involves very little expense thanks to the Federal and State adoption
assistance programs that minimize financial obstacles.
It will also depends if you take an agency, if you decide to adopt in another country... For example, 2015, the average cost of a US Newborn Adoption by agency was $41,532 and $34,594 without an agency.
Suggested for you: Adopting a Child in United States: – How it Works?.