List your Favourite BDSM related book/s (fiction or non-fiction).
Does Sunstone count? It doesn’t cover my particular kinks, but I love the characters and storyline. (It focuses on the start of a relationship between a female dom and a female sub.)
It’s purely online, though. If you’re only counting physical books, the selection is pretty slim because I haven’t read many kinky books. I did recently get Fetish and You, which is decent, but has some problems with it. I’ll probably review it here eventually.