Amazon now offers the Shark HE601 Air Purifier for $299.99 shipped. Normally fetching as much as $450, today’s massive $150 cut marks a return to the all-time low which we’ve tracked only once before. Just in time for cold and flu season, Shark’s flagship HE601 air purifier is ready to eliminate up to 99.97% of dust, dander, allergens, smoke, and more from your home atmosphere. It employs SenseIQ technology to routinely monitor your home’s air quality, with an array of six high-speed micro fans to clean an area of up to 1,200-square feet. You can even check the air quality for yourself via the display panel, and know that it’s great for pet maintenance too with odor-specific protection. Hit the jump to keep reading.