Redbox has announced that they will be running a Valentines day promotion from February 1st through February 14th. If you rent two movies at one time you will receive an e-mail within 72 hours with a promotion code for a FREE rental. This promotion code will be good for one week.
Please keep in mind that both of the rentals will need to be made under the same e-mail address and reserving two movies online does not coupon, they will need to be rented at the kiosk.
(Thanks Chi-town Cheapskate!)