Originally Posted by LovinMySoldier
You might want to take a look at how your bed is made before you buy another mattress. It doesn't sound like the bed frame is supporting the mattress. So regardless of what kind of mattress you buy it is going to start sagging again due to lack of support. Even poor quality new mattresses should last longer than a month or two. Anyways just a thought. :)
That's what I'm thinking too. There has to be a reason why all those mattresses are having the same problem after only a month or so. If I were you, I'd look at the frame and either have it fixed or buy a new frame and then get a mettess.