Spotify includes it with a Premium subscription, which is a pretty sweet deal if you're already paying for music. You can just add it to a playlist and listen anywhere. Audible is the most obvious choice, of course, but I've been using Spotify more for audiobooks lately just for the convenience of one app. It's definitely on there—just search the title and it should pop right up.
I found it a bit monotone in the middle sections. The initial intensity and the climax were great, but during the political buildup and world-building explanations, the narration lacked energy and started to blend into background noise for me.
My final, utterly non-scientific piece of evidence: I didn't get lost. With abridged books, I often find myself confused about how characters got from A to B, or why they suddenly feel a certain way. The connective tissue is missing.
That never happened here. The plot unfolded with clear cause and effect, and the character motivations remained consistent and understandable throughout. For my brain, that's the ultimate test. It passed with flying colors. It's the whole story.
No, and honestly, I'm glad. I've had audiobooks where a bonus chapter from a different narrator's perspective felt jarring or ruined the pacing. 'King of Battle and Blood' has a tight, propulsive plot with a very specific mood. Adding an extra domestic fluff scene or a gimmicky interview might have undercut the dark, intense atmosphere it builds so carefully over 13 hours. The audiobook delivers a complete experience. When it's over, you sit with the feelings it created. That's better than a bonus feature, in my opinion.
The ebook has highlights and quotes that are easy to revisit. There are some deliciously dramatic lines in there. With the audiobook, those lines are ephemeral—you hear them, you react, they're gone. If you're the type who likes to screenshot a particularly good line or trope, stick with the ebook. The audio is for the experience; the text is for the keepsakes.