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Amazon [amazon.com] has 12-Pack 12-Ounce Essentia Ionized Alkaline Water for $6.35 – 40% at checkout – 5% when you check out via Subscribe & Save = $3.49.
Shipping is free with Prime or on $35+ orders.

Savings
40% off coupon applied at checkout. Subscribe & Save orders only. (check and activate [amazon.com])