Update: This popular deal is only available for a few more days.
Audible is offering New Subscribers: 1-Year Audible Gold Digital Membership for $99.50. Thanks gallymimus
Note, this offer is not available to existing Audible members or customers who have been paid Audible members in the past 30 days. After your first year, your Audible membership will continue until cancelled at the then current full price (currently $149.50/yr), you may cancel at any time.
Offer available from January 13, 2020 at 12:00AM PT to January 31, 2020 at 11:59AM PT. This offer is not available to existing Audible members or customers who have been paid Audible members in the past 30 days. Offer applies only to an Audible annual membership sold by Audible.com. For the first year of your Audible membership, you will be charged the discounted price of $99.50
To be clear, you get 12 credits all at once, and they persist at least for a year (I think you can bank more than 12 but can't remember with this deal).
Note to existing subscribers, hotdogwater indicated that he was able to cancel and then resubscribe with this offer.