Amazon has 2-Pack 6-Oz Arm & Hammer Advance White Toothpaste (Fresh Mint) for $5.44. Add 3 to cart for $16.32 – 5% when you checkout via Subscribe & Save – $5.44 in cart multi-buy discount = $10.06 ($1.68 per tube). Shipping is free w/ Prime or on orders of $25 or more.
Note, you may cancel Subscribe & Save anytime after your order ships.