No. There are a couple of sites that will help you give away your audible promo codes. Jeffrey's audiobookblast is one and there is another that's posted here in the past but whose name escapes me (audavoxx?) Then there are blog/reviewers, and there's audiofile magazine which is a little more of a trade mag. And on the trade side there is Publisher's Weekly, which has an indie branch, booklife, which is doing some audiobooks. Booklife is more of a here's my book, do you want to review it scenario so it might be months if ever - same with audiofile magazine, but you can run (tradionally priced = expensive) print and web ads bot there and at Publisher's Weekly.
Fundamentally, however, because there's no price discounting on ACX/Audible, there's no carpet-bombing of free and 99c copies, so there are thus no hordes of promo sites all trying to build up their mailing lists. And having lots of reviews doesn't seem to drive sales. My current bestselling book, which is ranked 17th in Poetry (out of 1500 titles) on Audible, has no reviews. So what I do, advertising-wise, is try to get people to buy my book as their first membership purchase, because that gives a $50 bounty payout, which is far more than the book royalties. So I'm giving Audible the big love there for those bounties. And sales, but I make sure to remind people that they can try Audible for their first month for free. I'd more than double my revenue if I could get 10% of sales to be bounty sales (I'm less than 2% now). So it's a huge opportunity to try to sell OUTSIDE the traditional audiobook customer base - those folks are already members.
But you should ask Rosalind or Mark Cooper as they sell boatloads more than I do.
Are you coming out with some audiobooks?