Redbox promo codes that (usually) work at any kiosk:
Codes that work at Redbox kiosks at specific stores:
DVDATWAG - Good at any kiosk at a Walgreens store.
DVDATKROG - Good at any kiosk at a Kroger affiliated store (for Utah it's Smiths)
DVDATSONI - Good at any kiosk at a Sonic Drive-In
And then after you have used all of these codes with all of your different debit/credit cards, you can visit Inside Redbox and the ones that have been working most recently will be shown. If you have a smart phone you have an advantage and you can just look them up right while you are at the kiosk. If you don't, before you go make sure to write down a handful of them because some are time-sensitive and you might get a dud, but one of them is bound to work!
So... are you thinking about grabbing some pizza and a free movie and staying home friday night? Cause I am.
UPDATE: A few people have expressed concern that using these codes is hacking or stealing. Redbox has released these codes and made them available. A promotional code is meant for promoting the business, getting people to the kiosk in hopes that they like the service and will come back as a paying customer in the future. I have no doubt that they would disable them if they no longer desired them to be available for the public to take advantage of. The image claiming that you "never pay for redbox again" was not meant to be taken literally, but it could be if you would on only get Redboxes when there is a free code available and are impeccable at turning them in before your 24 hour trial period is up. I apologize to those who misunderstood my intentions in writing this post. I honestly just wanted to promote the Redbox service by sharing my knowledge about the promotional codes that have earned them my business over other competitors.
ANOTHER UPDATE: I was contacted by Redbox, they like this post and thanked me for writing it and linking to their site.
ANOTHER UPDATE: I wrote this post a year ago, so some of these codes are no longer working in all areas. I don't think there is any room for me to say "always" anymore but you can definitely try them and it's likely that some of them will work. I'm still having luck with a few of them. Also, if you sign up for Redbox e-mail or text alerts they send free codes out pretty often!