iRobot Roomba 581 Vacuum-Cleaning Robot for $279.99.  Shipping is $5.00 for a total of $284.99 shipped. Here is a screenshot for reference.  This vacuum-cleaning robot comes with on-board scheduling for all floor surfaces, counter-rotating brushes, anti-tangle technology, side brushes, gentle touch bumper, dirt and cliff sensors, and more.  Most places have it for about $359.