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.

As for its mopping function: You should swap out its dustbin tank for a water-filled one and it’ll gyrate its scrub pad against hard surfaces. There’s three options for mopping levels, and when you’re all done, you can toss the scrub pad into the washer to keep it clean.

Don’t stress anymore when you get home about having to mop and vacuum. You should enjoy a clean home when you get back from a long day of work, a nd the iRobot Roomba combination mop and vacuum can make that happen for just $400—a 50% discount for Amazon Prime members.