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Amazon.com [amazon.com] has Filtrete 12x24x1 Air Filter MERV 5, 6-Pack AC Furnace Filters for Home HVAC, MPR 300 Basic Dust Defense, Removes Lint & Household Dust, 3-Month Pleated Electrostatic (Actual Size 11.69x23.69x0.81 in) on sale for $27.96. ...Read More >