There is a new code from Redbox that you can text and they will send you a unique code to use for a free DVD rental.
My code came instantly and has a long expiration date- 2/29. I tested the code online and reserved Inside Out. It took off the $1.50 for the DVD.
Just text PUSH to 727272 to get the code. This code is valid online or with the Redbox app only.
Note you will need to return the movie on time or you will be charged.