Have you looked at the offerings at code.org/ and hourofcode.com/ ?
The former may be more than you're looking for, and the latter may be less than you're looking for, but they're both likely to be good starting points.
I started there and it has some pretty cool starts. That said, I am lazy and am hoping for a kit. We are trying to set up a five day camp that will give these kids a fairly immersive experience, something more than a collection of single day lessons. If I can't find anything, I will have to develop one.
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