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Sleep Innovations Shiloh 12-inch Memory Foam Mattress, King [link]
Huh. It's even a lightning deal. We bought two doubles in the 10" size as well for the guest rooms. Will not be going back to conventional mattresses. No evidence that they don't last as long and even if they don't I can buy multiples. Great sleep. Really improved ours a lot.
Well, this is the one I purchased. It's a bit more expensive now, but it's been right just shy of 3 years and it's stayed very firm. We got a king size.
Got this mattress and this foundation on Amazon a few years ago. I'm hella happpy with it -- the foundation ended up needing a little bit of reinforcement after a couple of festivious nights, but has held up well and breaks down easily for moving.
The mattress comes vacuum packed. It was unbelievable to me that a king size mattress fit in a box that was a little smaller than two kegs stacked on top of eachother. Both are Prime^^TM eligible.