It is wise to only associate with mattresses you can trust, like a new bed from mattress.com; because you never know what you get from just any ol’ bed on the street. Beware of running into strange mattresses! Sometimes it’s a bit hard to afford an amazing mattress. … you won’t get those cheap looking ads that almost always look like a scam. Yes, they …… I bought used mattresses from friends but never from a stranger.