There is a reported redbox code, valid today, Jan 27th only! Please let us know if you have success with this code; I have not confirmed it as working yet.
To get one free movie rental today, use code MOVIENIGHT.

Thanks, Bucktown Bargains!

Other Redbox codes that work one time per account:

DVDATWAG (good at Walgreen’s Redbox Locations)
DVDKROG (good at Kroger Redbox Locations, including Fred Meyer)