I bought the Novaform mattress topper a few months ago from Costco.
http://www.costco.com/Browse/Product...rPath=93*4257* It's been a great supplement to my regular mattress. I'm sure it's not quite as good as a full temperpedic mattress, but I would guess it has to be at least 70% effective as the real thing. My guess would be strictly based on the comfort level of using the topper. As I've never slept on a full temperpedic mattress. I have briefly lied down on one in the brookstone stores.
Anyway, it seems that Costco has recently acquired the full mattress under the Novaform brand. Here's a link:
http://www.costco.com/Browse/Product...Path=93*20637*
Now that I've tried the mattress topper, I'm now more interested in getting either the Novaform mattress or the real temperpedic mattress. Note that the Costco Novaform mattress is $550 for a queen in the stores (it cost more online) and the brookstone price is about $1600 for the same size.
Also, I notice that the Novaform mattress says it's about 12 inches thick, but only 3 inches of the top is premium form and the bottom 9 inches is standard form.
Are the temperpedic mattresses completely made of premium foam? I think they are only about 8 inches thick too, right? I would love to just buy the real temperpedic mattress, but the Novaform is about $1,000 less and I've found even the Novaform topper to be really great itself. So, I'm somewhat inclined to just spend the $550 for the Novaform, but hate to settle for less IF the temperpedic is worth the extra $1K.