I buy the Sharks from Amazon referbished. They are new just in open box usually. I get one that the tank comes off allowing me to vacuum completely under beds. Something most around here do not bother with. I stress the need for full vacuuming as we provide health and well being along with appearance and longevity of carpet fiber. They are cheap enough that I buy them when I see what I want during the year. If they break or look nasty, I just put the next one on the truck.. Mind you this is residential only. I use
CRB and a commercial vacuum on my other jobs. That keeps the residential machine looking and working better longer.