We're in the market for a new mattress. What are the things we should keep in mind? I would love to get a good quality one but I'm also a bargain shopper. Do places like wholesale clubs and mattress discounters have the same quality as Macys, etc?

While away at college, the dorms that I lived in had a mattress that was very light, and seemed cheap. However, it was very comfortable. Where might I look to find a wholesale, cheap mattress and bed set like those found in college dorms? Thanks so much