$275 for iRobot Roomba Vacuum ($549.99 List Price)

Three-stage cleaning system sucks up 98% of dirt, dust, and debris
Vacuum filter traps pollen, dust, and other allergens
Suspension system automatically adjusts to different floor surfaces
Spinning side brush and wall-following technology for efficient edge cleaning
Cliff-detection sensors helps avoid stairs and other drop-offs
Virtual wall lighthouses create invisible barriers for off-limits areas (require 2 C batteries each—not included)
Command center lets you control all functions wirelessly
Home base for docking, recharging, and safe zones during games of robot tag
1-year manufacturer's limited warranty on robot
6-month manufacturer's limited warranty on battery
Dimensions: 13.9″x13.9″x3.6″; 8.4 pounds