I saw an HN thread a while back where someone recommended a comprehensive book on some networking subject. I'm sure it was a good book, I was floored when I saw

I saw an HN thread a while back where someone recommended a comprehensive book on some networking subject. I'm sure it was a good book, I was floored when I saw physical copies being sold fucking $700. Unfortunately, a lot of the technical books I wish to read fall into this grift of academic texts.