There is one Charter school in PA for Gifted kids, but I'm not sure it isn't just nominally for gifted. Charter school laws tend to state that you cannot discriminate based on intelligence, which tells me that it would be hard to get a gifted charter school started.
Here is the one gifted charter. Reviews for it are mixed:
http://www.infinityschool.org/infinity Cyber charters supposedly have a lot of flexibility for gifted, but that entails homeschooling.
There are a lot more options for children in high school and middle school than elementary school.:/
