Filtrete 12-in W x 20-in L x 1-in MERV 11 1085 MPR Allergen Defense Extra Electrostatic Pleated Air Filter (2-Pack) in the Air Filters department at Lowes.com
12 X 20 X 1 Standard Pleated Air Filter FPR 5 (3-Pack) - Walmart.com
Honeywell 12x20x1 Furnace Air Filter MERV 11 - 12 Pack
Honeywell 20x25x1 Furnace Air Filter MERV 11 - 12 Pack
HDX 12 in. x 20 in. x 1 in. Allergen Plus Pleated Air Filter FPR 7, MERV 11 HDX1P7-011220 - The Home Depot
Do it Best 12 In. x 20 In. x 1 In. MERV 8 Furnace Filter - Power Townsend Company
20 x 20 x 1 Standard Pleated Air Filter FPR 5, 3-Pack, Air Filters Replacement | eBay
HDX 12 in. x 20 in. x 1 in. Standard Pleated Air Filter FPR 5, MERV 8 HDX1P5-011220 - The Home Depot