Take 60% Off Select Filtrete Air Filter Multi-Packs at HomeDepot.com while supplies last, and they ship free. All have Filter Performance Ratings of 7 or higher on a 1-10 scale, meaning they filter high percentages of allergens and microscopic particles out of indoor air. Prices start at $47.86 (reduced from $119.64) for a 12-pack or FPR 7 filters. These prices are the second-lowest we've ever seen. A limited number of size/FPR combinations is available, Sales tax is charged in most states.