nope, no need. You can use as many credit/debit cards as you want. I personally use three different cards. You can use promo codes once, per card...so with three cards, three movies per code...
If you got to www.redbox.com you can sign up to have the codes texted to you. Mind you, I signed up almost a month ago and today was the first time I received the codes. I chose to cancel the texts, since I get the emails from HERE free. I am one of the people that takes it on paper, along with THIS web addy, and I hand it out to people in line. Every trip to redbox I introduce someone new to the codes and to this website.
Thanks for the codes!! I guess people don't read, "This is an independent website and is not affiliated with Redbox." at the bottom of the page. "You" have no control over when the codes come out, what the codes are, etc...it is greatly appreciated that "YOU" pass this info along and save us from having to receive and wait for the texts on our cell phones. Today was the first time I've ran into anyone else using codes, everyone else has been totally shocked to findout they can get a FREE rental.