The CVS Facebook page has a coupon for a free candy or drink with no other purchase necessary. You can only sign up for the coupon today, but it'll be emailed to you and is valid through Sunday.
You need one of their Extra Care cards, which meant I had to dig around in my junk drawer. I only pricked my hands on ten loose thumbtacks before finding my card! If you don't already have one, you can signup here.