Here is a listing of some active promo codes I found. Log into your forum account and go to the My Account section. There is a promo code section where you may enter these. Hope you all enjoy.
SWCANTINA2018 - Flair
SWCELEBRATION17 - Pet Code
SWCANTINA17 - Mount Code
NYCANTINA16 - Mount Code
This one is active from time to time, about once a year.
REVANSFATE - Grants Rise of the Hutt Cartel and Shadow of Revan