Amazon has the 56-Ct Listerine Ready! Tabs Chewable Tablets (Clean Mint) on sale for $7.01 when you checkout via Subscribe & Save. Shipping is free.
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Also available:
Walmart has the 56-Ct Listerine Ready! Tabs Chewable Tablets (Clean Mint) on sale for $7.38 + Free Store Pickup. Alternatively, shipping is free on orders $35+.