This is my first "deal" post in the Finance forum so please be gentle.
Was talking to a Discover rep today and inquired about any extra cash-back promotions. She mentioned on St. Patrick's day, March 17 Discover will offer 2% Cash Back on all purchases. This is in addition to the quarterly promo so if you buy gas on that date you'll receive %7 cash-back instead of 5%. I was told that I was "signed up" for this promo so I assume you have to call in and have it added on in order to get the extra cb.