Been there, done all of it. It isn't so easy to find children through the foster children, especially if you're looking to find children with mild issues. Even those who are taken from their parents at a very young age may have big issues that haven't shown up yet, such as Fetal Alcohol Syndrome. And face it, for a child to be permanently removed from the family home, the parents have almost always done something awful that hugely impacted the child.
There are websites like
www.adoptuskids.org that have pages of adoptable kids but often, dozens of homestudied families are submitting on the same kids and you may never even hear back from the workers. There are message boards where potential adoptive parents talk about how they've been hunting for children--sometimes very challenged children!!--for 5-6 years and they can't even get workers to call them back.
Many states have PR campaigns that make you think that there are all these great adoptable kids in the system but I know far more people who finally gave up after years of getting approved, then searching and searching, than I know people who succeeded-- and none of these parents were searching for a perfect baby or even young child either.