The universalization of the self-emptying dock has also made it a much more affordable feature in general, even when no discount is present — so Prime Day deals on these robovacs mean you don't have to pay more than $300 or $400 to be off dustbin duty.

The Onson 2-in-1, with both vacuum and mop features, is built to handle whatever your pets throw at it -- and it's almost $300 off at Walmart. But you'll have to hurry, a deal this good won't last long.

As The Verge’s resident robot vacuum expert, I’ve tested dozens of different models over the last five years and have always highly recommended only buying robot vacuums when