This Act Kids Anticavity Rinse is now $3.99 on Amazon. It's already 11% off, but you can score it cheaper by using Subscribe & Save for 5% or 15% off. Then clip the coupon for $0.80 off and pay as low as $2.59.
By using Amazon Subscribe & Save, you'll automatically get your essential items delivered to your door and score a discount each time they ship.