Here are a few other codes that may work if you have not used them before:
For use at Walgreens only: DVDATWAG
You can use these codes once per card (you do have to swipe a credit or debit card to “rent” the movie).
To learn more about Redbox (or to find a location, see what’s available, or reserve a selection online), check out their blog here and their site here.
If you are new to using Redbox, Dealseeking Mom has a great tutorial here.