As of July 3, the iRobot Roomba Plus 405 is on sale for $399.99. This deal saves you $400 on list price, and is the lowest-ever price according to camelcamelcamel. Our robot vacuum expert has hand-picked this deal as one of the best ahead of Prime Day.

This is one of the best iRobot vacuums you can get. With its $799 price tag, it's prohibitively expensive. However, with this early Prime Day deal, you can save 50% off the regular price, leaving you with a high-end vacuum and mop for just $399.

Starting July 8, Prime Day will run for four days with deep price cuts on smart home gadgets, including the Roomba Robot Vacuum and Mop Combo from iRobot that drops down to an all-time low of $140 from its original $275 price tag.