You can also go to
www.redboxcodes.com and click on 'Redbox Codes' at the top and get all the current codes. There are some one-time use codes as well that can be used anytime. I thought they listed the current Monday code, but it looks like there's a bunch of Monday codes. I'm not sure how they list them since I rarely get out to rent movie. I just keep that URL handy just in case.