I think you're asking the wrong question (maybe).  The more important question IMHO is how much of the product's price is due to the price of oil.  I've heard the price of carpet has gone up considerably because the pad is made from oil.
That was one of the next things I was going to start considering. First I just wanted to understand the allocation to various uses.
I bought a bed last month from a local manufacturer (Puget Sound).  The salesman claimed that their materials cost had gone up around 30% since Katrina.  Foam rubber prices were even worse.