Weird... This is the one that comes up through search for me: https://www.audible.com/pd/Sci-Fi-Fantasy/Leviathan-Wakes-Audiobook/B00P9XDQFY

Has every indication of being available in the US (shown on Audible.com, price in USD, separate section for .com and .co.uk reviews, buy button for my credit or with money)... but then it just doesn't work.

If I try to buy via Amazon (link) I get an error saying "I already tried to order this title" (no shit), and that I should wait ten minutes for the book to appear, or try again later. Has been happening since Saturday...

EDIT: re your edit: yeah, that's the amazon link I mentioned. So that's the one that tells me I already tried to buy it..

Yeah, something has gone wrong with this book on Audible. I logged into Amazon, checked my audiobook library, found Leviathan Wakes, drilled down into its properties, and pulled out the link to the product page. That link is invalid. For a damn audiobook that I own. Hope I never have to download it again.

https://www.audible.com/pd?asin=B00558PPVQ&ref=kinw_myk_ro_title_ab_adbl

The error:

Shucks. This product isn't available.

We know this is frustrating and we're really sorry it happened.

I'd say the book was removed. Same with my audiobook copy of Caliban's war. Link for Abaddon's Gate still works, though.

It's almost like someone is deliberately trying to tank the marketing and promotion for the series.

Edit: Dug this up, however.

https://www.amazon.com/Leviathan-Wakes/dp/B073HBQXMT/

Seems to be the audiobook but it has different cover art than the version I bought (was back in Feb 2016, iirc). Try buying that one.