Hi nancymariec,
The better options or possibilities I’m aware of that are in reasonable driving distance from you would either be in the list for the Portland region in post #2 here or in post #2 here which includes some stores that are a little closer to you in the Eugene area. If you are comfortable driving that far I would make sure to include Parklane Mattress in your research because you would be hard pressed to find better quality value choices in your larger area. They are a member of this site which means that I think highly of them and I believe they compete well with the best in the industry in terms of their quality, value, service, and transparency.
There isn’t a forum list for the Corvallis area so time permitting I’ll take a look over the next few days to see if I can see any better possibilities in the immediate area as well
Phoenix