Given that you have already admitted that you have every intention of stealing books to read the fact that a device is associated with one or more store really is not all that important is it?
All e-readers have a book store that they are connected to. Some, Sony, Kobo, and Nook use a file system that makes it easier to read another stores format. This does not mean that there are more books available for those e-readers and with the Agency Model the prices are pretty much going to be the same.
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