Gotta give it to CVS for creativity. While everyone else is giving $.05 back if you use a reusable bag, CVS has come up with this interesting deal.
Buy their Green Bag Tag for $.99, attach it to your reusable bag and every time you shop at CVS and use your bag they will scan your Green Bag Tag. After the 4th scan you will earn a $1 ECB. Limit of one green tag use/scan per day per household.