SAVE $400: As of July 11, the Shark Matrix Plus Robot Vacuum is on sale for $299.99 at Amazon. That's a 57% savings on the list price.

With a 4.5 out of 5 star average from more than 23,000 reviews, this vacuum is a best-seller. Right now, it can be found for an amazing 60% off during Prime Day, reducing the price to a whopping $99 from its normal $249. With a discount this steep, there’s a fair possibility Amazon is even making a loss on the flash sale.

Amazon Prime Day includes tons of vacuum deals that go up to 80 percent off. Shoppers can score discounts on cordless vacuum cleaners, uprights, robot vacuums, and handhelds from top brands including Dyson,