So apparently Redbox gives a Free movie on the first Monday of the month code to customers who sign up online. Use QNGJ7KD at Redox kiosk to get a free movie rental today.
Additionally, try these two codes for free movies: DVDONME and REDBOX. These should work any day of the month
All three codes can be used by you on different credit cards so this actually can get you lots of free movies.