5 years ago I bought a mattress from these guys http://www.mattresses.net/
I wanted a latex mattress after laying on one at a store but didn't like the $4000+ price. Lots of options and I took a chance and got the bed that has medium on one side of the bed and firm on the other. I figured if I didn't like the firm I could send it back and would only have to ship one piece. The combo works, I like the firm and my GF likes the medium. Its a risk buying something like that online but I liked the ability to choose the bed components and was willing to pay return shipping if I needed to change something out.