I don’t believe a coupon code is necessary. The last promo on the Carbonated Hempd Beverages, was you would get a choice of a free Rocket High or California Te Negro (Black Tea) you just had to note on your order which you selected.
The Non-Carbonated promo was buy one get one free while stock was available. As far as I know there are still some available and the website doesn’t state anything to the contrary. Now would be a great time to put your order in !