Amazon has the Coway Airmega Mighty marked down to two-thirds its normal price. Tired of the stale, fetid air looming over your apartment like a cloud? Check out the Coway Airmega Mighty, an already wallet-friendly home air purifier that's even cheaper right now as part of the Amazon Big Spring Sale. It's currently marked down to just $154 , a $76 discount from its typical price, but you'll want to move quickly if you're interested, as the deal is only available for a limited time. Coway Airmega Mighty AP-1512HH Despite its low price tag and squat stature, the Airmega Mighty is capable of cleaning a substantial amount of space. At full bore, it can handle a 361-square-foot space, although you'll get the best performance, and save your ears, if you're closer to a 200-square-foot room. If you don't want it running constantly, there are built-in timers to automatically shut off after 1, 4, or 8 hours, or you can use Eco Mode, which will run until the Might doesn't sense any dirty air for half an hour.…