Coway Mighty Air Purifier This Coway Mighty Air Purifier ($188, originally $230) is a popular choice that customers and our editors love. Its tiny lightweight design can simply tuck away, so you'll forget it's even there. Its best feature: the eco mode. If it doesn't detect any pollution, the purifier automatically shuts off. Image Source: Amazon Coway Mighty Air Purifier $188 from amazon.com Buy Now