This code from Offers.com worked for me... not sure if my discount code is a one-time use or not. Try it and see, you have nothing to lose if you want to try a cheap robo vac. I plan to use this in the office to keep it tidy.
If the code works for you, let us know!
"When you make a thing, a thing that is new, it is so complicated making it that it is bound to be ugly. But those that make it after you, they don’t have to worry about making it. And they can make it pretty, and so everybody can like it when others make it after you."
- Pablo Picasso