For Prime members only, Amazon offers the Perrier Sparkling Natural Mineral Water 16.9-oz. Bottle 24-Pack for $14.99 with free shipping, via the directions below. That's the lowest total price we could find by $9, although we saw it for $2 less in October. To get this deal:

1. View the Perrier Sparkling Natural Mineral Water 24-Pack for $19.99
2. clip the 20% off coupon on the product page
3. add it to cart via Subscribe & Save for a final price of $14.99