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I believe that you will be charged $2 extra if you download a book via 3G while you're outside the US (I'm sure that someone will correct me if I'm wrong). There are no charges if you transfer it via USB or WiFi. Personally I'd get the 3G version; I find being able to look up information about the places I'm visiting to be extremely useful while travelling, and you'll find that free public WiFi isn't nearly as common elsewhere as it is in the US.
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