There is a new code available today for a free rental at Blockbuster Express kiosks today only:
FREEMONDAY
You can get the movie free of charge for one day only so make sure you return it in time to avoid late fees!
I would strongly encourage you to reserve your movie online and test the promo code to be sure it works. I just tested it and it worked for me, but I seem to hear from people each week that could not use the codes.
The code worked for me online.