$10 Audible credit from Verizon, despite the terms and conditions, it's working on Australian audible.com accounts without a membership plan.
Accounts currently not on a plan can also get two free months.
Credit expires on the 25th of January 2015
You can use the credit to buy two $0.49 and two $0.99 whispersync pairs (make sure the regular price of the audio book is $14.95 or more) to get a $10 coupon.