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I mostly buy my books from Amazon, it's quick convenient and the prices are as good as I'm likely to find anywhere. I'm not really worried about them suddenly going away and leaving me without the ability to get to my books, barring some world-wide calamity.
As far as I know no-one has studied it, but I'd bet that Amazon's selection is better than all the ePub sellers put together (counting only those who have interoperable DRM).
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