Hi cgibsong002.
I hope the heat in Portland isn’t affecting you and your wife too badly!
Thanks for sharing your mattress history and general history of injuries and pains. It is unfortunate to hear you’ve had a streak of bad luck with sagging mattresses. Because you did mention experiencing back pain, this thread talks about some of the most common causes behind back pain post #2 here that may be helpful.
You mentioned that you’d like to keep with memory foam, despite your bad luck. My guess, without knowing your height/weight, is that it’s likely the memory foam used in these models hasn’t had an adequate density for durability based on your body mass and sleeping positions. For someone within a BMI range of 20 - 30, the recommendation we offer is that If your mattress is one-sided then to make sure that any memory foam is at least 4 lb per cubic foot. If the mattress is two-sided then use a minimum density of 3 lbs per cubic foot.
While I can’t speak to these locations personally, what you want to keep in mind when looking to identify a quality retailer is their ability and willingness to disclose the materials in their mattresses and their knowledge, experience, and ability to give you the guidance that is necessary to help you make meaningful comparisons and your best possible choices.
A knowledgeable manufacturer or retailer that carries mattresses that have fair value, that you can trust to give you accurate and meaningful information, and are focused more on educating their customers than they are on “selling” their customers, can turn mattress shopping from a difficult and frustrating experience filled with roadblocks and uncertainty into one that is actually enjoyable and save you many hours of research and frustration.
While not located in Oregon, one of our Trusted Members - Ghost Bed - has some memory foam options you might be interested in. I would also suggest looking at Nest Bedding and the memory foam options at Mattress to Go.
I also searched the forum to see if any other forum subscribers had shared positive Portland area experiences, and Parkland seemed to be the common denominator but there was also some chatter that it potentially was purchased by Bedmart.
Google led me to Portland Mattress Makers and Stumptown Mattress, but neither lists the foam densities of their mattresses and I have no personal knowledge of their transparency, etc. but it may not hurt to call and see what kind of information you can get out of them if your preference is to stay local.
I hope this helps you move your mattress search forward!
NikkiTMU