If you don't find a playgroup, maybe you can start one. You really only need one other kid to start out. Just find something interesting to do together. Believe me, I know how hard it is. We move so often that friendships are always a challenge. I've come to realize that my child learns a lot about being social from his home life. Introducing other kids is a challenge, but when we get outside with balls, kites, swimming, sports, etc, it does happen.

When my child was 5, I was encouraged to get him in summer camps with kids his age. But when I went to pick him up, he was outside, alone with a group of teenage camp counselors. I didn't feel comfortable about that. I don't know if it helped him or not, but they never complained about him. But much later I learned that one of the counselors was so touched by her experience with my son, she decided to go into special ed.