My Roomba! I just got it this week after moving to a huge house with hardwood floors. What a lifesaver, especially with a five year old and a golden retriever.
My kitchen aid is up there along with the uber cheap single serving coffee pot! Did everyone else get theirs at Menards last year? I think they were $5 or so.
As for replacement parts for everything, the Mending Shed's website has helped me out in the past with broken appliances. Worth a shot.