Staring today, May 30th, when you rent two RedBox movies (in a single transaction), you will get a promo code sent to you for one free rental. You can expect to receive your code via email within 72 hours after you rent your movies. Keep in mind that you will NOT get this free offer if your rental is made with a promo code or web offer. This offer is also not good those movies you reserver on line.
Make sure you will be around to redeem your free offer as it will be good for only one week after the date of issuance. Find a Redbox near you here.