Tried the site just now, plugging in numbers for Seeley listed one choice at $2900 --- nope, like @Mdragger88 said, if I pay too much (again!), I'll hang onto it longer than its "useful lifespan".There is an on line retailer - US Mattress that has a lot of info on mattresses. They deliver and remove for $99. They tell you the depth of the mattress as well. You don't need bowstring if you have a platform. The box spring is to give support to the mattress ... I am assuming the platform is solid.
Good luck with your search!!
Thanks for chiming in though, I'm learning...