https://www.parklanemattresses.com/ in Portland is one of the members of the site that is the first place I would visit. They have a wide selection of different types of mattresses (innersprings, latex, memory foam etc), use good quality materials and have great value. I drove down to their Tualatin factory outlet from Seattle and was very impressed. They have stores in Beaverton, Clackamas, Gresham, Sherwood, Lake Oswego, Tualatin (factory outlet), and Salem in Oregon.
There are also a few other factory direct manufacturers in the area as well that may be worth visiting …
http://www.bedtimemattresscompany.com/ Portland, OR. Makes a range of innerspring, memory foam, polyfoam, and latex mattresses.
http://mulliganmattress.com/ Portland, OR. Makes a high quality Dunlop latex mattress and a hand built solid wood bedframe.
https://mattressdepotusa.com/ Lake Oswego, Tigard, OR. Easy Rest (memory foam), Restonic (latex hybrids), Emerald, Lady Americana.
https://www.mattresslw.com/ Gladstone, OR. They make their own mattresses and also carry Easy-Rest.
http://www.cottoncloudfutons.com/ Portland, OR. Makes their own futons using wool, cotton, and their recycled PET wellspring fiber and now carry Dunlop latex mattresses as well. You can read more about them in post #34 here.
https://www.mattresslot.com/ Portland, OR. They certainly fit the profile of the type of retailer that I generally like to deal with. They carry 45th Street Bedding which are high quality mattresses and they also carry a range of mattresses made by other local manufacturers, as well as OMI.
Furniture Row® Store Locations - Store Hours & Addresses Salem, Ashland, OR. Yakima, WA. They make a wide range of mattresses including a mostly latex mattress with the option of adding a latex or memory foam topper and traditional innersprings using higher quality foams. I would avoid the mainstream brands they also carry.
https://www.mattressworldnorthwest.com/ Salem, OR. They carry OMI (latex), Englander. They also said they would provide foam specs.
https://www.bedmartmattresssuperstores.com/ Portland OR. Has some non-major brands that may be worth looking at as long as you can find the specifications.
http://nwmattress.com/ McMinnville, Portland OR. Has a large selection but you’d need to be careful with some of the items and find out specification.
Discount Mattress - The Furniture Shack - Discount Furniture & Mattresses Portland, OR. Not a large selection. Some Englander and Easy Rest.
https://www.mattressmegastores.com/our-brands/ Hillsboro, Milwaukie, Portland OR. Mostly larger name brands (which I would avoid) but also a few smaller brands that may be worth considering shuold you be able to find out specs.
https://www.morfurniture.com/ Portland, OR. Has some Sherwood mattresses that may be good value if you can find out specs.
mattresspro.net/ Vancouver, WA. Has some latex mattresses.
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There are some very good options and a wide range of mattresses available in the Portland area.