I received today a new promo from Redbox. I hope it applies to anyone who signs up so you can take advantage of this offer.
If you rent three movies between April 14 - 30, you will receive a promo code on May 7th for a fourth movie free. I always like free stuff!
So head on over to Redbox ( I get nothing for telling you this), sign up and don't forget to use that same email address when you rent your three movies.
The only way they know you are participating is to use that email address.