NOTE: this is over now; you can choose 2 of these for free using the standard Audible mechanism for paying members, but no more pre-ordering all of them for free. This time the preorders had everything -- so thanks for following along.
Sometimes Audible rewards attentive members with not only the choice of two free audiobooks every member gets, but also a brief chance to preorder several of the same audiobooks that will be part of next month's choose-two offer. If you preorder these (for free), you'll own them when the choose-two deal goes live, and you can choose from the others without losing these.
So, here's what's online now -- please post a comment if you see more!
And one more just found 10/26: https://www.audible.com/pd/How-Ch...B07YYKJW55