Several audible discount type things going on but can NOT be APPLIED concurrently to the same title. This is a CHANGE from my initial post. Just spent a couple of hours with the terrific audible.com support folks and they, too, had been misunderstanding this. They hope to change the wording on each sale/promotion material to clarify!! Please see the "EDIT" at the end of this posting.
I'm not certain which are for members only but:
1) Listening Rewards
All the audible.com catalog qualifies for "buy 4 - get a $10.00 coupon" through 11/30/2012 11:50ET; you can do this twice for a total of 2 coupons ($20.00) and you do not have to buy 4 at a time. You can accumulate them over the time period and, when you hit 4, a coupon will be scheduled for you to be received no later than 12/6 (good only on audible.com and must be used by 12/31/2012)
***From audible.com for clarification
*You must purchase 4 or more audiobooks by November 30, 2012, at 11:59 PM ET (US). Audiobooks must have a regular price of $14.95 or more to be eligible for the 4 audiobook purchase minimum. Limit two rewards per customer. Your coupon will be placed in your account at the end of the promotional window, and no later than December 6, 2012. You will be notified by email when the coupon is available in your account. The coupon is good for audio content only and will expire on December 31, 2012.
2) Semi-annual Sale (ends 11/20 at noon ET)
From a 500 book selection, prices are 1/2 off
3) Standard Sync with Kindle pricing
For many Kindle books, the related/connected audible.com version will have a discounted price. (Not all will be synced or discounted.)
EDIT: Bottom line: 1) you cannot apply a purchase toward the Member Rewards program AND the Semi-annual Sale program AND the Kindle-discounted program or any combination of the two for the same audible.com book. If a book is less that $14.95, it will not apply toward the Member Reward program even if no other sale or promotion is applied.
Audible.com greatly apologizes for any confusion about these offers. (I think audible.com is so great anyway that I have no issues with this!)