Double coupon! Amazon has the 4-Pack 3.4oz Sensodyne Repair and Protect Whitening Toothpaste for $21 - 20% off coupon (click here to activate) - 20% off coupon (check "Save an extra" box, eligible on first S&S order for this product) - 5% off with Subscribe & Save (can cancel anytime) = $12 with free shipping on $35+ or with Prime.