Ecolife Technologies via Amazon takes an extra 30% off a range of Waterdrop replacement refrigerator water filter multipacks via coupon code "EL7WOFZP", with prices starting at $18.89 after coupon. Plus, Amazon Prime members bag free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping starts around $7.) The deals, with prices after coupon:

• Waterdrop Replacement Water Filter for Samsung Aqua-Pure Plus Refrigerators 3-Pack for $18.89 ($27 off)
• Waterdrop Replacement Water Filter Whirlpool Refrigerators 3-Pack for $19.60 ($27 off)
• Waterdrop Replacement Water Filter for Maytag Refrigerators 3-Pack for $23.79 ($24 off)
• Waterdrop Replacement Water Filter for Samsung Refrigerators 4-Pack for $32.19 ($22 off)
• Waterdrop Replacement Water Filter for Maytag Refrigerators 6-Pack for $38.85 (pictured, $40 off)