Check Your Email! CVS Coupon for 20% Off

I just opened up an email I had gotten from CVS, and it contained a printable coupon for 20% off your entire purchase with your Extra Care Card.  It does say that it excludes sale items, so I'm not sure how useful it might be.  It also expires on Sunday.  If you are needing something like over the counter medications, this could be useful.  You can use coupons on the non-sale items, but the 20% will be deducted from the final price after coupons, it says.