Hi rkarsk,
Have you called and talked with the retailers or manufacturers on the Calgary list to give them your criteria (including your budget) and see what they have available that may be worth testing (step 3 in the guidelines)?
Most retailers or manufacturers don’t list foam densities on their sites because it would overwhelm the large majority of customers that have no idea what they mean but the better ones will gladly provide this information to their customers that are more knowledgeable and know the important of finding out this type of information.
In most cases it would be futile with major manufacturers but with smaller manufacturers or better retailers it’s just a matter of talking to them and asking.
This is exactly the type of “blind purchase” that the guidelines warn against and would be a very risky choice that I would be concerned about long term durability yes. I would never buy a mattress where you don’t know the quality of the materials inside it and can’t identify any “weak links” in the mattress or make meaningful comparisons to other mattresses … particularly with major brands.
If you follow all the steps in the tutorial post one by one you will have by far the highest odds of success in any budget range.
Phoenix