Mint Automatic Hard Floor Cleaner, 4200  for $149 with FREE shipping ($199 retail)
Compact robot floor cleaner runs up to 3 hours on single charge using microfiber cloths or most brands of disposable cloths.  Great for people (like me) who only have hardwood floors (no, DH, we do not need that big upright vacuum cleaner!)

Guided by North Star Navigation System to methodically clean open areas, around furniture and rugs, and along room perimeter
Whisper-quiet operation; turns itself off when finished
Low maintenance with no bins to empty or filters to change
Measures 9.6 inches wide by 8.5 inches deep by 3.1 inches high; 1-year warranty