24-count Perrier for $10.80 (45 cents per bottle) on Amazon

Amazon has got this 45-count pack of Perrier (16.9 oz. bottles) priced on sale at $13.49 - 20% online coupon = $10.79 with free Prime/SuperSaver shipping, or just under 45 cents per 16.9 oz. bottle.  

The quantity limit is 10 per account, (but the 20% coupon applies to only one pack).