[YMMV] $10 IN FREE CREDIT @ AMAZON WITH ELIGIBLE CITI CREDIT CARD

You can get free $10 in amazon credit if you have any Eligible Citi credit card by making it default payment for Amazon one click settings. Here is the link to the offer. This promo has been around for a while but if you have not taken advantage of it then you can register your Citi Credit Card on amazon.com for this promotion. The promotion is valid till Aug 15, 2017. If for some reason the offer page says that you are not eligible for the promotion you can remove all the Citi Credit card from your Amazon.com profile and try registering through the link after 24-48 hours of removing the Citi Credit card.

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Below are terms from the offer page for your convenience:
TERMS AND CONDITIONS

• This promotional offer applies to the purchase of eligible items made with an eligible Citi credit card. The $10 credit may be redeemed on the purchase of physical products sold and shipped by Amazon.com and excludes gift cards, Kindle eBooks, instant videos, MP3s, and all other digital content and downloads.
  
  
• Offer available only to customers who were served an advertisement promoting the offer. To claim the offer, customer must first click through the ad and then complete the additional actions described. Eligible cards are only consumer branded Citi credit cards, except Costco Citi credit cards.
  
  
• An Amazon.com account with a valid Citi credit card is required to claim and redeem this credit. If, for any reason, your Citi credit card is inactive, denied, or ineligible, you will not be eligible to claim or redeem this credit. You are responsible for the final purchase price after the credit is applied, plus applicable taxes and shipping charges.
  
  
• This promotional offer is valid for a limited time only. Offer limited to one per customer and account. Amazon reserves the right to modify or cancel the offer at any time. If you violate any of these terms, the offer will be invalid, and the credit will not apply. This offer may not be resold, is nontransferable, not redeemable for cash, and is void where prohibited by law and in case of fraud. This offer may not be combined with other offers.
  
  
• Credit must be redeemed by 11:59 p.m. PT on August 15, 2017. Unredeemed credit will expire after that time. If any of the products purchased with the credit are returned, your refund will equal the amount you paid for the product, subject to applicable refund policies. Credit redeemed on a Kindle or Fire device will be applied to the Amazon.com account registered to the device.
  
  
• American Airlines, AAdvantage and the Flight Symbol logo are marks of American Airlines, Inc.

Hat-tip: [Doctor Of Credit]