I am selling a full size mattress topper. It is 3 inch thick (10 year warranty) and product info. is at the website:
http://www.therapedic.com/_product_32230/Therapedic_Memory_Touch_Mattress_Topper
It sells for $200 at Bed Bath & Beyond.

I have been using it for about 3 years and selling it out cause I am leaving the US.
This is a good mimic of Tempurpedic mattress topper. (Of course it is not as firm & dense as tempurpedic)

Personally I would give 6 or 7 out of 10 for this product when I give 2 or 3 for the cheap, fake topper in the market and 10 for the genuine tempurpedic one.

I am selling it for $40.