Coway is a regular player in our best air purifiers buyin guides, and right now Amazon is running limited-time deals on three of its most popular Airmega models with discounts of up to 39 percent. If none of these quite fits the bill, our guides to the best portable air purifiers and best smart air purifiers are worth a read. The Mighty has been one of the most consistently recommended air purifiers on the market for years, and this deal brings it to its lowest price in a while. Auto mode and Eco mode take care of the rest without you having to think about it. Despite its compact 8.66-inch footprint, it’s rated for up to 810 square feet (or 405 square feet cleaned thoroughly in just 30 minutes) and packs in a real-time AQI monitor, auto mode, sleep mode, and a night light.