Coway Airmega 200M Air Purifier with True HEPA and Smart Mode in Black You can't beat the sale price of the Coway Airmega 200M Air Purifier with True HEPA and Smart Mode in Black ($119, originally $229). One of the coolest details is that it has coloured LED lights that let you know how clean or dirty your indoor air is. Image Source: walmart.com Coway Airmega 200M Air Purifier with True HEPA and Smart Mode in Black $119 from walmart.com Buy Now