But here's the rub: If you want to buy them separately . . . you have to wait until later for the individual releases (beyond Books 1 - 3), as she plans to release them along with the always-impressive art.
You can find it right here at this Audible link.
Once again, I don't get diddly if you buy this. But Abbie does, and hey, somebody ought to reward her for her fine taste in narrators.