Amazon has the iRobot Roomba 870 Vacuum Cleaning Robot as a Gold Box Deal today for $449.99.  For reference purposes, the 850 is $450 at Target (but save 10% with store pick-up) and the 880 model is $549.  If nothing else, you can use it to annoy pets!

• iAdapt Navigation uses a full suite of sensors to navigate and adapt to your changing home
• AeroForce 3-Stage Cleaning System delivers up to 50% more cleaning performance
• Tangle-free extractors help prevent hair and debris clogs
• AeroForce High-Efficiency Filter traps fine dirt and dust
• Conveniently schedule up to 7x per week, or just press CLEAN on the robot