Update: This popular deal is still available.

Amazon has Coway Airmega 400 Smart Air Purifier (Graphite, 1,560 Sq Ft Coverage) on sale for $349 or *less. Shipping is free.

*Note: Select accounts may have a 5% off coupon on the product page that can be applied to the order making this $331.55. Must be logged into your account to apply coupons.

Key Features:

• Designed to clean spaces up to 1,560 sq. ft. in 30 minutes.
• Combination of a pre-filter, deodorization filter, and True HEPA Filter reduces 99.999% of 0.01-micron particles, including pollen and other allergens; It also reduces 99% of volatile organic compounds and odor.
• With its Smart Mode feature, the Airmega automatically adapts to its surroundings by adjusting fan speeds based on the room's air quality; That means your unit is energy efficient without compromising effectiveness.
• When the air quality in the room remains purified for 30 minutes or more in Eco Mode, the fan will turn off to conserve energy, kicking on again when pollution is detected.
• When the Airmega's built-in light and pollution sensors detect that the room has been dark and the air clean for 3 minutes, Sleep Mode reduces the purifier's noise and power consumption.
• 24/7 pollution monitor air quality throughout the day, adjusting purification to the necessary level and saving energy when it's not needed.
• The air filter indicator tells you when the filters need to be replaced and the prefilters need to be cleaned for maximum efficiency, based on how much air they have processed.