I bought a $129 mattress @ wal-mart that's never been used except once by the cat. It's still sitting in storage. It feels medium-nice

I wanna say it's a serta brand... I can let you know tomorrow when I go out there (there's no light) (and I have to get some stuff outta there anyway).
I think it was in Sweden, but I'm not sure... one of those S countries... instead of doing "back to sleep" to lower SIDS rates they wrapped their crib mattresses in organic material or had the family use organic mattresses (way expensive! holy cow!)... and their rate lowered as much as ours did, probably because of the chemicals and off-gassing and such. So whatever you get, remember to let it off gas for a few days with moving air before using it. We let our new king mattress off-gas for a week and it still had that ick chemical smell!
Good luck!