Amazon has a targeted offer for $10 Amazon credit when you switch your 1-Click default payment method to an eligible Discover credit card. They’ve run similar offers for Citi and Chase in the past, I guess now Discover gets a turn to give me an easy ten bucks.
The link should show your eligibility (for the account that is currently signed-in). It probably won’t work if your 1-click default method is already Discover. You could try and remove it first. I had a Discover card already in my account, but not set as 1-click, and it worked for me. $10 credit valid on items both sold and shipped by Amazon.
If you have a Discover card, you may also want to sign up for their free Social Security Number Monitoring and New Account Alerts. I keep my Discover it card open for its rotating 5% cash back rewards.