Cellfire is having a special until 3pm (CST) today. It is very simple!! Just sign in to your account (if you don't have one, you can sign up. Very easy!). You will receive a message telling you whether or not you've won one of 10,000 e-coupons. There are $1, $5, and $10 coupons available.
The e-coupon will be automatically added to your card. I won a $1 coupon. It was loaded to my Kroger card, and I used it this morning when I was there shopping!