I voted one, but I meant to click two. Oops. I have butter fingers.
I mostly shop at Amazon, primarily for the convenience. Everything eventually ends up on Calibre, but the ease of buying a book in bed and not having to do anything extra to read it is incentive enough to keep me locked into my device's proprietary store.
I also shop at Black Library. I'm a big ole' Warhammer fangirl, and their ebook bundles are usually not only great collections, but much better value for money than buying the books individually.
I get a lot of books from Humble Bundle, too, but that's not really a shop, so I didn't count it.
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