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In case you would like to see the fine print from the email message that I mentioned above, here it is, :

Offer available until April 11, 2019 at 11:59 p.m. PT (US). Offer available only to Audible members enrolled in a paid membership at the time of pre-order. Customers enrolled in a free trial are not eligible for this promotion. Eligible customers who pre-order a book on Audible.com between April 4, 2019 at 12:00 p.m. PT (US) and April 11, 2019, at 11:59 PM PT (US) will receive a promotional code for a $5 USD coupon via email on or around April 19, 2019. You must redeem the promotional code within 30 days of receipt by clicking the link in the email. This will add the coupon to your account. The coupon applies only to cash purchases of audio products sold on audible.com (not including gift purchases). Coupon will expire 30 days after being added to your account. Coupons cannot be resold, transferred for value, redeemed for cash or applied to any other Audible account. Offer may not be combined with other offers and is limited to one per customer and Audible account. 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.