You are kidding right? Sony is not known in the mainstream for having an e-reader and its bookstore is universally panned as awful. Apple has hardly any share in the e-book market, has stated that they don't think people read enough to actually care about the e-book market, and have said that they are likely to pull out of the e-book market if wholesale pricing returns.
Amazons only real competition in the US is BN. Globally, Amazons biggest competition is going to be Kobo.
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