To get FREE 32 oz Mountain Dew Big Gulp at 7-Eleven you will need to download their app on your phone and register. Go here or Go Here for your app download! The free coupon is located in the Savings section. Make sure you don’t click Redeem until you’re ready to use it, it’s only good for 15 minutes when you do. Valid July 1st – 3rd, while supplies last.