Hi KingSpore,
The first place I would start your research is the mattress shopping tutorial here which has all the basic information, steps, and guidelines you will need to make the best possible choices … and know how and why to avoid the worst ones.
The most important part of a mattress purchase is your confidence in how well it matches your unique needs and preferences in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences).
Outside of PPP … I would also make sure you have all the information mentioned in this article about any mattress you are considering because the quality/durability of the materials relative to the price you are paying is the next most important part of the “value” of a mattress purchase (you can see the quality/density guidelines here).
Finally the other parts of your personal value equation that are most important to you (including the price and any return or exchange options) would also be an important part of the “value” of a mattress purchase.
I would also confirm that the manufacturer of your mattress is listed on the CertiPur list here* (some retailers use the CertiPur logo but aren’t on the list). I believe that the Brentwood Well-Being mattresses are made by SilverRest which also isn’t on the CertiPur list.
ADMIN NOTE: *Removed 404 link|Archived Footprint: certipur.us/pages/for-consumers/find-products/
I would also be uncomfortable dealing with a retailer or manufacturer where I didn’t know who made the mattresses they are selling or the country of origin of their foam (regardless of where the mattress was made or assembled). You can see some comments about Asian imports in post #6 here.
In the case of Sleep Shop which sells the Brentwood Well-Being mattresses … their contact email is @thecompletesleepshop.com and thecompleteslepshop.com forwards to www.meritmart.com
Merit Mart in turn is related to Silver Rest and BRK Group in Pico Rivera including BRK Imports which in turn imports (or at least was importing) from China.
All of this leads to more questions than answers and I would personally be a little cautious in dealing with them and at a very minimum I would make sure you know the specifics of every layer in the mattress and that you can confirm that they are CertiPur certified and that they are using the logo legitimately.
Dreamfoam is much easier because they are a member of this site, are CertiPur certified, are sourced and made in the US, are transparent about the materials in their mattress, and compete well with the best in the industry so I would have no hesitations about purchasing a mattress from them that was likely to be a good match for you in terms of PPP and that used the type and quality/density of materials that you are comfortable with in your budget range. They also make some lower budget memory foam mattresses if you are committed to or prefer memory foam.
Phoenix