Update: Deal over.
iRobot Roomba 652 Robotic Vacuum Cleaner – Link 
As a Prime Day deal, this is on sale for only $249.99!
This was selling for $374.99 yesterday and is now its lowest eevr.
- Conveniently schedule up to 7x per week, or just press CLEAN on the robot
- 3-Stage Cleaning System loosens, lifts, and suctions dirt
- Navigates under furniture and around clutter
- Cleans all floor types
- Contains a Lithium Ion battery and automatically recharges itself