My ex b/f hasn’t seen his son in 7 years. My son is now 8 years old.He also pays $15 monthly when it is suppossed to be $200 monthly. We dont know where he lives.How much will it cost if we use a lawyer? How easy will it be for my husband to adopt my son? We live in pennsylvania.
My husband is also a truck driver who is barely home. How often will they require him to be home for this process.

You need to go and talk to a lawyer who deals in family law. The first consultation is usually free.
Before your husband can adopt your son the fathers parental rights have to be terminated. If he won"t sign/or can’t be located you will have to petition to courts to have his rights terminated. Only then can your husband file to adopt the child.