Hi Mark in Seattle,
The better options or possibilities I’m aware of in and around the Seattle area (subject to making sure that any mattress you are considering meets the quality/value guidelines here) are listed in post #2 here.
You can see some comments about them in the Seattle list and a forum search on seattlemattress or an exact phrase site search on Seattle Mattress (you can just click the links) will bring up more comments and feedback about them as well.
Phoenix