|1. Go to the Citi Card website and login Link [citi.com]|
2. Click the banner at the bottom of the page for a discounted gift card (I've seen Fandango and Callaway so far)
3. When prompted to go to the 3rd Party Website Truaxis, click "Continue".
4. When the offer you clicked is displayed, click "See your offers" in the bottom right.
5. Click through the offers until you see the Lowes offer, mine was on Page 4.
6. Click on the offer, and then click "Continue" again.
7. Click "Get Offer".
8. Enter your credit card info and click "Complete Purchase".
9. Print your gift card for use in-store or online.
Other offers I noticed that may be of interest:
JC Penney's $10 gift card for $5 & $25 gift card for $15
Domino's $10 gift card for $5