Originally Posted by SuperD
Get a 4” foam topper and cut to fit on your current mattress. You can get a decent topper at WalMart for about $120 or so.
That's just about the only advice I would accept when talking about mattresses. It's easily disposable and can be tried as a topper and an underlayment, doubled and halved.
The op didn't tell us
How could anyone ever recommend a mattress?