The iRobot Roomba 870 Vacuum Cleaning Robot is the Deal of the Day on Amazon.  It’s currently marked down $150 to $419.00 (reg. $599.99).  This is the lowest price I’ve seen to date.

• 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

If you are interested in a much cheaper robot vacuum, I recommend the iLife v3.  I saved up and got one…and I love it.  I’m sure it’s not nearly as nice as the more expensive ones, but it is doing everything I need it to do for $158.99!

• Low noise design: Quiet 55dB design, robot vacuum provides a comfortable surroundings.Cleans larger space up to 150sq meters.
• Powerful suction ability: powerful suction, barrier-cross ability to height of 12mm max, climbing ability for 15 degree max.
• 4 Cleaning modes: automatic cleaning/spot cleaning/edge cleaning /schedule cleaning, automatically docks and recharges.
• Drop-avoidance: sensitive IR sensor at the bottom detects the high gap (not less than 5cm height), it will avoid dropping.
• Multi-Floor Surface Cleaning: Works on Hardwood, Linoleum, Tile, Low/Hard Carpet Floors – Not Designed for Thick or Shag Carpets