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Here is the link

Note: the terms are very vague this time, no end date & contents will fluctuate etc

Spoiler:

"Offer is available for a limited time and is for Audible members only. Applicable to credit purchases only. Offer is not available from within the iOS version of the Audible app. To redeem this offer, follow the link provided and add two audiobooks to the cart from the selection provided. When you check out, you will be able to purchase both audiobooks for one credit – either by using a credit you have, or by purchasing one at the time of checkout. Offer is not transferable and cannot be combined with any other offer. Audible reserves the right to modify or cancel the offer at any time. If you violate any of these terms, the offer will be invalid. Content included in sale selection will be updated periodically."

Update: It looks like this sale with run thru the end of September and the contents will change periodically.