Having just researched adoption recently, domestic adoptions are much more reasonable. They start around $1500 and can go up from there. You definitely have to be willing to accept an open adoption. After going through what I have in the past, I am just not willing to go that route.
International start around $15,000 and go up depending on where you adopt from and whether you travel there or have them brought to you. We are saving up and will still probably have to to a 2nd mortgage, but we are willing to do that so that we don't have to take the chance at losing a child after we bring them home.
You start with a home study that is pretty involved with the agency you choose and the process goes from there. It can take up to 2 years or as little as 3 months to get a match with a child.
I still hope to be able to carry a baby to term, but not confident about that chance. They haven't found out why I have had my miscarriages either. I know how devastating it is for you. I will still keep you in my prayers.