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,

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.

Prime Day is nearly as good a time to buy a robot vacuum on sale as Black Friday. For new robot vacuums that debuted at CES 2025, it's the first big sale event of the year — most of them were far too fresh to go on sale for Amazon's Big Spring Sale in March.