We have foster-adopted. It is the most financially feasible way to go. There were some costs for us. For instance, we had to do some work on our house to get it to pass licensing (example...they require a certain type of lock on home exit doors in our state, which did not fit our doors due to age of the house, so we had to get new doors entirely and handles and locks for them). I think each time we have been foster licensed, home stuff has totaled $2000-3000. The cost came up again the second time because we had changed the ages for which we were licensed and our housed needed more babyproofing.
During the time you do foster care, your state will reimburse you for care, and sometimes other costs (transportation to therapies or dr. appts for example). The amount of reimbursement, and what is reimbursed, depends on the state. In my state, my dw and I end up paying something out of pocket each month for care.
When it comes to the adoption, we paid our attorney $1000, which was reimbursed fully by the state after the adoption. Because of our ds' special needs, ds' receives a monthly "adoption support" subsidy to pay for things like therapies and special foods (most kids who were foster-adopted qualify for some type of subsidy, though amount will vary by the child's circumstances...some kids adopted through agencies, etc. will also qualify due to special needs). He also will be eligible for Medicaid through his childhood, which we can use as a secondary insurance, as this was a part of his "adoption support agreement."
We have another foster-adoptive placement, and we may also seek a private, non-agency adoption in the future (which we are anticipating will cost $3000-10,000 in our particular area if we get a match within state). So far, we've been able to scrounge up money as needed (and my dw's parents have helped a little), but when we do private, it will be more of a stretch. We do have a small amount of inheritance money we can use, though it will be eaten up entirely by the whole thing.
We feel strongly that we really don't want to enter into parenthood of any particular child having aquired a bunch of debt. Since raising kids is so expensive as it is, and since any kid could end up having special needs, it feels yucky to start out already in the hole. We want to be smart with our money, and fortunately, so far in our lives we've managed to get buy without aquiring student loans (amazingly...though it meant I worked four jobs while going to school even with scholarships!), and without any credit card debt. The only debt we have is our home loan, and a small personal loan we got to help pay for part of a used minivan we bought (we used some of our cash savings for the rest). We think it is smart to "pay as you go," given the economic realities of this day in age. We looked into using home equity, but decided against it because we feel home equity is used most appropriately in our case when it pays for home improvements that increase the value of the house. Then it can help pay for itself.
We would qualify for a small personal loan, but probably not a huge one. I don't think the tax credit will help us since we don't usually owe anything in taxes (???).
I don't know.