Don’t know if you’re aware, but the page at the end of that Amazon link for Culture books lists two of his non-Culture sci-fi novels, The Algebraist and Feersom Endjinn. Also short story collection The State of the Art is mostly non-Culture. There’s another non-Culture sci-fi novel of his, Against a Dark Background, which I highly recommend. Some of his non-sci stuff is really good too and some of it is really fucked up. The man could write.