The cost for a confidential intermediary and related court fees can be around $500, but varies by state and agency. For persons who cannot afford the fees, there is usually assistance available from the tax-payer supported state department or the non-profit agency, and anyone can request from them how-to request this help. Most agencies charge a fixed fee which includes everything, and only in the most extreme and unusual circumstances ask for additional funds. If the adoptee is unable to locate (or would prefer to use a third person) to find his or her birth father, often the same confidential intermediary can be used for an additional fee.
Although practices vary state by state, most adoptions start with the birth mother reviewing dozens of adoption profile books  or online profiles of prospective adoptive parents. Usually, these are adoptive families who have retained that agency or attorney to assist them in the adoption process. Most US states permit full openness not just regarding identities, but also personal information about each other. Just as the adoptive parents want to learn about the birth mother's life and health history, so does the birth mother want the same information about the people she is considering as the parents for her child.
Once the adoption has been approved, the agency transfers the infant from foster care (if used) to the adoptive parents. After the infant has spent a few weeks or months with the adoptive parents, a local judge formally and legally approves the adoption. The natural mother has until the final court hearing. The infant is then issued a second, amended certificate, sometimes stated to be a birth certificate, that states the adopting parents are the child's parents. This becomes the adopted person's permanent, legal "birth" certificate. In the post WWII era, laws were enacted which prevented both the adopted person and adoptive family from accessing the original, and the information given to them can be quite limited (though this has varied somewhat over the years, and from one agency to another). Originally, the sealed record laws were meant to keep information private from everyone except the 'parties to the action' (adoptee, adoptive parent, birthparent and agency). Over time, the laws were reinterpreted or rewritten to seal the information even from the involved parties.
The social stigma of unmarried mothers, particularly during the Baby Scoop Era (1945-1975) rendered them social outcasts. By the 1980s the situation improved greatly and the vast majority of unwed mothers kept their babies. In a mother driven society after WWII infertile couples were also seen as deviant due to their inability to bear children. The social experiment of taking the children from "unmarried mothers" and "giving them" to adoptive parents became the norm during the BSE. These adoptions were predominantly closed. The records were sealed, biological mothers were told to keep their child a secret, and adoptive parents told to treat the child "as if born to".
It's equally important adopters understand that in a closed adoption little to no information will be exchanged with the birth parents, including their choice to arrange an adoption with the couple. This can feel like a distant business deal for some adoptive couples who want to know the nuances and personality of the mother of the child they're being placed with. Other adoptive parents may feel the separation of adoptive and birth parent eliminates possible instability an openly known birth mother's lifestyle may bring into a family dynamic. Also, in an open adoption, if communication is lost between the birth mother and adoptee, the child may become confused and hurt.