Two audible specials. First, the 2 for 1 sale is
here.
Second, you can get $5 credit if you preorder any book on this
list. BEFORE you order, make sure that you are opted in to get ads from Audible. Just the 'most anticipated' books are eligible for this.
In that same place where you opt in or out of newsletters, ads, they have a feature where you can opt in for authors and series. First time I noticed that.
edited to add: the preorder list includes a lot of series popular here at Mobileread, but I specially wanted to mention Jim Butcher's Battle Ground is included!