Reserve a movie and get a free rental credit for one night after returning your reserved movie. No code needed. Restrictions may apply. Limited time offer. Go through this link to get started.
Sign Up for a textclub for a free rental text code every first Monday of the month by text message (standard text rates apply). See site for details.
Text "EMAIL" to 727272, then reply to Redbox's confirmation with your email address to get a unique code good for a free rental in your inbox.