Offers from CVS will vary by account. I was pleasantly surprised to see this deal in my e-mail.
I've never seen a $3 off $15. They usually have a much higher spending amount.
It's worth checking your e-mail to see if you got it too or a different deal. You can go to CVS.com to create an account if you don't have one yet.
On the very top, it will say "sign in or create an account".
It's worth doing as I get these offers at least once a month.
See the best deals (matched with coupons) at CVS here.