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.

Some of the best robot vacuums we've tested are on sale for Prime Day, including savings of up to 50% on top-rated models from iRobot, Shark and Eufy.

There's no question that Prime Day is the best time to buy a robot vacuum. As Amazon's sale dwindles, the deals are still solid. We found big discounts on a wide range of models from the likes of iRobot,