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One of the conveniences of buying from supermarkets like Amazon is that everything's in one place. But independent, specialist shops then miss out on your trade.
Readers on Libreture can list where they bought their e-books, helping you find great indie bookshops and buy direct.
Also: I don't add any kind of associate code to links.
They're 'vanilla' links, to ensure Libreture concentrates on the needs of its readers, and not on grabbing money from links, ads or any other crap.