Monoprice has their Strata Home by Monoprice Cadet High Suction, Robotic Vacuum Cleaner for $49.99 (regularly $99.99) with Free Shipping for a limited time.
The Strata Home is ultra-compact at just over 3″ tall (3.34″) and will easily clean under your furniture, with the dual side brushes giving you a wide cleaning path. The 10-watt motor is powerful enough to tackle pet hair, carpet, and hardwood floors. It is loaded with features you would find at prices over four times higher! The anti-drop sensor enables the vacuum to easily navigate around stairs or other precarious zones and the anti-collision bump sensor will keep your vacuum from shifting furniture, such as chairs or other small objects, around your home.