Latex - Pure Bliss Nature with or without a topper. (we got one but I like it plush - without it, much firmer) - try them at the the healthy back store and order from
http://www.matt-to-go.com We just got one from him and he was much cheaper even with shipping and amazing to work with. I tried to get Healthy Back Store to price match but they kept being sketchy about it so I gave up.
Also, Wayfair has an nice basic rize adjustable bed for the best price that works great with the latex mattress and was affordable. I looked at but it was much more expensive than Pure Bliss and not 100% of the good latex that Pure Bliss was.
We got ours a few weeks ago. I was nervous about ordering it all but it was fine. One concern with the new memory foam is some have a horrible smell. I almost went with a tempurpedic but the smell talked about online concerned me.