CVS coupons

I received an email from CVS with 2 different coupons available. You can save $4 on a $20 purchase. Te other is to to get their Green Tag free. This is a tag you attach to a reusable bag. Each time you use that bag, they will scan the green tag. After every 4Th visit you get $1 ECB. The tag is normally $.99, so it would take four visits to pay for the tag. That is a great coupon to use for sure,both coupons expire on 11/22/09. So check your email.