Audio platforms? Totally legal ones? I'd just check Libby if your library participates, or maybe Audible's got the exclusive. Spotify's been getting into audiobooks lately too, but I'm not sure if that particular title is on there. Purchasing through Audible, Google Play, or Apple Books is the most straightforward route to guarantee you get the correct, full version.
Sometimes you can find free trials that give you a credit to use on any title, which is a nice way to get it. Just remember to check the narrator—I think it's read by three different people for the different timelines, which is pretty cool and adds a lot.