V.
Check some of the papers, there's usually lots of day camps listed and you can always call and ask about special pricing, ages etc. You should also check some of the churches, a lot of them hold day camps. As for over night camps I have no clue. I have looked into it a little because eventually I would like my kids to try one, but I haven't really found any advertised here.
One of the church organizations my church is attached to has week long over night camps but the only one that includes little ones are meant for the whole family to go.
V.