This Roomba robot vacuum is 40 percent off for Prime Day

The iRobot Roomba 104 robot vacuum is on sale for $150 just ahead of October's Prime Day. That's a nice little discount of 40 percent, which represents a savings of $100.

This is a newer version of the unit that topped our list of the best budget robot vacuums. It's an entry-level robovac that gets the job done. The cleaning motor is fairly powerful and it ships with a multi-surface brush and an edge-sweeping brush. The vacuum uses LiDAR to map a home and to help it avoid obstacles when cleaning.

It's also been equipped with specialized sensors to prevent falling down stairs. Steps are the natural enemy of all robot vacuums, except maybe this one. The Roomba 104 integrates with the company's proprietary app, which allows for custom cleaning schedules and the like. The robot can also be controlled via voice assistant ...