The Crest Advanced kid's fluoride toothpaste 3-pack is on sale on Amazon for $11.91. Plus, there's a $3 off Subscribe & Save coupon on the product page. You'll end up paying as low as $8.31 for your first order (that's $2.77 per toothpaste). Just remember that this order needs to contain five or more eligible items in order to unlock the highest Subscribe & Save discount.
Learn more about Amazon Subscribe & Save (including how to cancel your Amazon subscription).