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I bought THIS mattress a few months ago. I was suffering from lower back pain every day, and my girlfriend suggested that it might be from sleeping on too soft of a mattress. My back pain was significantly reduced in as little as a few days (not completely gone, but a large part of that has to do with how much lifting I do at work). Strongly recommend.
Amazon. This changed my life.
It's lasted a year and a half and it's $231. That's already better time/$ than you got after the last one and it's not noticeably different than day 1.