I saw this robot vacuum and thought, hey why not- I like being messy, this guy's has me covered. Set to buy it, I find that this little bot does not move on its own. I have to push it around? I pass.
However, I like the concept I had when I first saw it. Combine this robot with the robotank, and you have a winner. Everyone's dinner table is a maze of obstacles. A few modifications. Increase the tank's mobility power and battery capacity. Attach the tank as a frame to the vacuum.
Nevertheless, enjoy the link. Only $15 USD