For the 4-year-old, Leapfrog has a tablet with educational games for $99. Not sure for the "tween." I think they're too young for an adult one but I'm sure few people share my sentiment. Folks need to consider that predators love the fact that kids have mobile devices with Wi-Fi that they can use anywhere but, especially, away from their parents.
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Hello, Just wanted to let you know incase you haven't found one yet, I got my 5 year old and 9 year old the google epad for like 60.00 if you watch sales. they will be getting them for christmas. It has a camera and is wifi capable. Mine will be used for educational as well. They like to take my phone and use it, So i thought this would be better for them.