I've been very happy using MyAnonamouse for ebooks and audiobooks. It's a private tracker, but it's easy to join with just a quick interview--much less gatekeepy than most. Just read through the rules and the requirements on the invite page and you'll be fine. The ratio requirements are also much less onerous than most private trackers and you start out with 10 GB of free upload; see the rules for details, but pretty much just grab a few freeleech torrents to start out with, make sure to seed everything for at least 72 hours in 30 days, and you'll be golden. Helps that ebooks and audiobooks are pretty small, so unless you start out by downloading the entire ASoIaF series or something you probably won't blow through the initial upload credit very quickly.
That being said, as far as I can tell there doesn't seem to be an audiobook version of that particular book, so I think you're out of luck there.