I mutated the search and just looked for SP Dynasty. After doing the full search and finding only your post here.
I think this is what you are looking for on their web site.
http://www.sealy-contract.com/prod-dynasty.aspx
It is the CSS series available in multiple styles. I have my fingers crossed that you can find it!
Use this search and you should find a bunch of places to look.
"Sealy Posturepedic dynasty"