Amazon has 28-Count Listerine Ultraclean Access Disposable Snap-On Flosser Refill Heads (Unflavored) for $1.53 when checkout via Subscribe & Save. Shipping is free.
Note, You may cancel Subscribe & Save anytime after your order ships. Select the later date from the "First Delivery On" menu to get traditional S&S checkout instead of adding to your cart.
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