Listerine Antiseptic Mouthwash, Cool Mint, 33.8-Ounce Bottle

Amazon.com has the Listerine Antiseptic Mouthwash, Cool Mint, 33.8-Ounce Bottle currently on sale for $4.99.

To get it for $3.74 with free shipping:

login into your Amazon.com account;
clip the $0.50 coupon that you can find on the product page;
use Subscribe & Save to checkout (can cancel at any time, details here).

The retail price is $7.84 and that makes this bargain a significant 52% off, saving you $4.10.