I assume this is a target offer since when I refreshed the screen to grab the URL, it disappeared
Where did you see the offer on the amazon PrimeNow homepage?
Refresh that page 5 times and the link will reappear.
Code Amex20 works for $20 off your first prime now order. Or $10 PrimeNow10 and another offer I posted in the other thread for all members for $10 off a $35 purchase.