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Waterdrop Direct via Amazon [amazon.com] has select Waterdrop Advanced NSF 42 Certified Refrigerator Water Filter Replacements (Various) on sale from $ 19.99. Shipping is free with Prime.[list][*]Waterdrop Direct via Amazon [amazon.com] – Waterdrop Advanced Series NSF 42 Certified Refrigerator Water Filter Replacements for Whirlpool (Whirlpool 4396508, 4396510, 4392857, Kenmore 46-9010, NLC240V, EveryDrop Filter 5, EDR5RXD1, PUR W10186668) (3-Pack) for $ 19.99 with promo code FILTER234.