I agree... they are verrry expensive.  Sears probably has a better sale.
  Oh, another thing that you could try that is a cheaper option, Lil Me, is to buy this extra padding from Costco.  My grandma-2-be has this extra padding on her bed and she says that it's the best thing.  I haven't tested out her bed yet, but will soon because I'm looking into one of these for now before I can afford something better.  At least, I'm not sleeping on my guy's OLD double-sized FUTON!