Home Depot is taking 50% off select Filtrete Air Filter Cases. Plus, take $10 off your order of $100 or more with coupon code JUNEHD [Exp 6/23]. Shipping is free on all filter cases included in this promotion. The pictured Case of 12 Filtrete 20 in. x 20 in. x 1 in. Micro Allergen Reduction Red Pleated FPR 7 Air Filters is $60 with free shipping. It's $70 for a 6-pack on Amazon.