Amazon has 9-Pack of 16-Count Trident White Sugar Free Gum (Minty Bubble) for $5.06 when you ‘clip’ the 30% off coupon on the product page and checkout via Subscribe & Save. Shipping is free.
Note, you may cancel your Subscribe & Save subscription any time after your order ships. Coupons are typically one use per account. A Prime Account may be needed to checkout.