Hi timmarkwell,
Welcome … and I’m glad you found us.
Dreamfoam and Brooklyn Bedding would certainly be great quality/value choices but I would be cautious about Bed in a Box mattresses because they use 3 lb memory foam which is a lower quality and less durable material than I would suggest in this budget range. You can see my comments about Bedinabox in post #2 here.
The better options or possibilities I’m aware of in and around the Portland, OR area including Salem (subject to making sure that any mattress you are considering meets the quality/value guidelines here) are listed in post #2 here. I would make sure to include Parklane Mattresses in your research.
Phoenix