I tweeted about this last week, but I wanted to share it just in case you missed it! Promo code
F2AMA8TG3 works for a free movie rental at Redbox! (Expected to expire on 5/8/13). (Didn’t work for me on 4/14/13 at the Kiosk, but may still work online)
apparently BREAKROOM and DVDONME are still working if you haven’t used them before.
Keep in mind Redbox promo codes work one per credit card not person