Amazon has the 2-Pack 6oz Colgate Baking Soda and Peroxide Whitening Toothpaste (Brisk Mint) for $3.78 - 15% off (check “Save an extra” box, eligible on first S&S order for this product) = $3.21 with free shipping on $35+ or with Prime (extra 5% off for 5+ subscribe and save orders).