Amazon has the 4.2oz Colgate Optic White Stain Fighter Whitening Toothpaste on sale for $3.49 - $1.40 off coupon (check “Save an extra” box, eligible on first S&S order for this product) - 5% off with Subscribe & Save (can cancel anytime) = $1.92 with free shipping on $35+ or with Prime (extra 15% off for 5+ S&S orders).