iRobot's Roomba 860 is currently on sale for $424.99, over at Amazon, which is currently $75 off of the regular price of $499. The Roomba 860 from iRobot is one of its many robot vacuums that are on the market. The Roomba 860 is the more mid-range model (think of the Moto G5 Plus of Robot Vacuums). It does offer up to two-times the battery life of many other robot vacuums out there. It does also have iRobot's iAdapt technology, which maps out your home so that the vacuum knows where to clean without missing any spots.
It also senses stairs, so that it doesn't fall down the stairs (which would likely total the Roomba 860). There is also the AeroForce 3-stage cleaning system built in, which makes this a great robot vacuum for cleaning a home that has pets, so that you'll be able to have people over that might be allergic to your dog or cat. It's also eligible for Amazon Prime's free shipping. If you are not a member of Amazon Prime, you can sign up for a free 30-day trial and take advantage of unlimited two-day shipping as well as the many other perks that Amazon Prime includes.