My wife and I both got this offer in an email from Audible today:
$50 off 1 year of Gold Annual membership (12 credits up front, for $99.50+tax, works out to just over $8/credit)
$50 credit toward an Amazon Echo product (actually $49.99 credit which gets you a free Dot).
It expires on 3/25. Not sure if it's open to everyone or just those who were emailed, but here's the link CS gave us:
https://www.audible.com/ep/lto
Seems like a good deal if you happen to be in the market for what if offers, which my wife happened to be, so we took advantage. She had an existing membership so we had to call CS to get her upgraded and get the promos applied.
ApK