I actually own one of these and love it! Grab a iRobot Mint 4200 Hard Floor Robotic Cleaner for $139.99 from Groupon. Shipping is free.
Here’s my extra little personal note on this robotic cleaner – if you’re expecting this to take over all your floor cleaning, you’ll be disappointed. It’s a great helper, though. It’ll keep the dust to a minimum, give a little shine to the floor, and keep the kids entertained. It does spread out my floor cleanings though.