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Amazon [amazon.com] has 18-Pack 12-Oz Polar Seltzer Water (Black Cherry) on sale for $ 5.35 when you checkout via subscribe & save. Shipping is free with Prime or on $ 35+ orders.
18-Pack 12-Oz Polar Seltzer Water (Black Cherry) $5.35 w/ S&S + Free S&H w/ Prime or $35+