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Costco Wholesale [costco.com] has for their Members: 2-Pack 3M Filtrete Ultra Allergen Reduction Deep Pleat MPR 1550 Filters (various sizes) on sale for $ 29.99. Shipping is free.
Available sizes:
- 20x25x4
- 20x20x4
- 16x20x4
- 16x25x4