There is another code available today for a free Blockbuster Express movie rental. You can head over to any kiosk before midnight tonight and get a free rental with code: SSD19B or G419A.
This one should be good for a Buy One Get One Free movie as well: GA19B.
You do need to return the movie by 9pm the next night or you will be charged a $1 per day late fee. Find a kiosk near you here.