Prime Day has returned for the fall, which means there are tons of deals to check out at Amazon. Robot vacuums (and cordless ones for that matter) are some of the machines we most recommend picking up during sale events like this because you can often save hundreds on the stick price. One of the best Prime Day robot vacuum deals we found is on the iRobot Roomba Combo j9+, which is a vac-and-mop hybrid. You can snag it for $800 right now, which is $600 off.

This is our pick for the best robot vacuum and mop combo. The Roomba Combo j9+ covers all the bases — and floor types — as it offers just about everything you could want in such a device.

Our favorite robot vacuum and mop combo device is on sale for Prime Day. The Roomba Combo j9+ is $600 off for the event.

It has strong suction, the ability to give your floors a deep scrub and the intelligence to avoid obstacles. The accompanying Clean Base not only allows the Combo j9+ to self-empty, it refills the robot's liquid tank with water or solution. As such, you shouldn't have to empty the debris bin or top up the base's liquid tank for weeks at a time.

You can set up vacuuming and mopping routines, and ask Alexa or Google Assistant to start an ad hoc cleaning. The Combo j9+ can map out your home faster than previous models and you can label objects to help direct the Roomba to clean a specific area.

The Combo j9+ is certainly a more premium option, but there are other Roombas on sale for Prime Day. Another vacuum and mop combo (Y0140) has dropped from $275 to $219. Meanwhile, you can pick up the even more budget-friendly Roomba Q0120 vacuum for $190. It usually costs $250.