Hi jmoss,
I did a quick calculation based on layer thickness and product weights on the intelliform support core and it worked out to about 1.8 lb density. This would be typical for a mattress in this budget range and I would consider this to be acceptable as a support layer. The ILD though isn’t listed although it would be safe to assume that it was between about 28 and 35 based on the fact that these mattresses are geared towards “averages” and either less or more than this would make them either too soft or too firm for too many people.
Of the few online sources that I listed earlier in this thread …, some offer interchangeable support layers and/or memory foam layers to various degrees.
The first group are Trusted members of the site which means that I think highly of them and believe that they compete well with the best in the industry in terms of their quality, value, service, and transparency. They also provide a 5% or more discount and/or a bedding bonus on any mattress purchase (unless there is a special discount or sale which is greater than the members discount and can’t be “stacked”) when you mention that you are a forum member here.
Christeli are a factory direct manufacturer (over 80 years) specializing in memory foam mattresses, with two of their higher end models featuring latex cores. They have some innovative designs and use good quality materials (including 5 and 6 lb memory foam, 2 lb polyfoam, and latex). and holds one of the best standards in the industry for quality/value, knowledge, transparency, and service. Their 3 collections and most of their 9 mattress models have various adjustability options to cover a large range of sleeping needs and preferences.
Comfort Sleep Systems They carry memory foam it in various densities and will tend towards the more durable 1.8 lb and higher polyfoam in the poly up to 2.6. The Interchange system is a premium mattress for those who want to customize.
Luxi Sleep carries two foam mattresses: a basic and a highly adjustable mattress: The Luxi 3-in-1 Adjustable Mattress (Memory Foam Quilted & Rayon Cover)
Interchangeable Comfort and Support Modules for best-needed configuration and Luxi One Mattress. See mattress specs here.Mattress To Go excellent retailer in Shelby Township, MI one having one of the highest levels of expertise in componentry and matching customers with the right mattress carrying only high-quality lines (including Memory Foam beds) at an excellent price point.
Magic Sleeper A consumer-friendly mattress store in Pottstown, PA that carries various brands as well as their own make.
Memory Foam Comfort Canadian online retailer that sells a range of memory foam mattresses that use good quality materials including 4 and 5 lb memory foam, Energia 3 lb HR polyfoam, and high quality/density base foam. They are good quality and value and provide good guidance over the phone. Their memory foam and polyfoam is also CertiPur certified.
Nest Bedding (Albany & Berkeley, Chicago, Costa Mesa, Denver, Minneapolis, New York, Palo Alto, Phoenix, San Francisco, Santa Monica, Seattle, Studio City). They are knowledgeable, experienced, and transparent and carry several memory foam mattresses that they sell locally and online including traditional memory foam mattresses and memory foam/pocket coil hybrids (including two-sided) that all use high-quality materials. Joe the owner left a larger manufacturer that had a somewhat exaggerated focus on “green” mattresses to form his own company because he wanted to “do it right”. They offer several Discount codes here: to consumers coming from TMU (they will also match any other larger discounts for the members here).
Oklahoma Mattress Company is a great manufacturer in Oklahoma carrying may types of mattresses.
Parklane Mattresses in OR or WA states local manufacturer focusing on high-quality and wide range mattresses and foundations.
Sedona Sleepis a sister company to Arizona Premium Mattress. This is also one of the new breed of “simplified choice mattresses” and is a two-piece component system that is somewhat unique because it includes a separate finished “base mattress” that is made from 7" of 1.9 lb polyfoam which can be used by itself as a low-cost medium firm mattress. It can also be used underneath an existing topper if you already have a topper and the mattress underneath it has developed soft spots or is sagging and needs to be replaced.
https://www.sleepez.com/ The top 3" layer of their latex component mattresses can be ordered with 5.5 lb Sensus memory foam instead of latex for those who prefer the feel of sleeping on a memory foam comfort layer. The support layers are latex and can be both re-arranged and exchanged for different firmness levels. Of course, the price here reflects that the base layers are latex rather than polyfoam and the memory foam is a slightly higher density of Sensus. Side by side split layering is also available.
Some of the Non-members that I believe also offer some good quality and value memory foam mattresses include …
http://www.selectabed.com/ They are a factory direct manufacturer. I have talked with Dr. Rick Swartzburg at length who designed these mattresses and I think highly of his designs which are CertiPur certified. They also make a more premium line of Tempflow mattresses here which use a very high-quality memory foam which is custom poured to their specs which they can also customize (and are Greenguard Gold certified). They can help you compare their mattresses to other mattress lines (such as Tempurpedic) as well. See post #9 here.
https://www.foamorder.com/memory.php They are also a factory direct manufacturer that use a high quality 5.3 lb memory foam and an exceptionally high-quality base layer (either 2.5 lbs or 3.0 lb polyfoam which is close to the highest density polyfoam base layer I have seen in a memory foam mattress). They also have an edge support feature for those who sleep with more of their weight concentrated on the very outside edge of their mattress or who often sit on the very outside edge of their mattress. Also, CertiPur certified.
http://lakemattressandfurniture.com/ They are a factory direct manufacturer that have a range of US made memory foam mattresses that use 4 lb memory foam and up to 2.4 lb base foam which are good quality and have some good value and they are fully transparent about their materials as well. They use all US made foams.
http://www.sleepwarehouse.com/memory-foam-mattress.aspx Available with either 3" of 4 lb Aerus or 5 lb Sensus with interchangeable support layers. There is a choice of ILD in the interchangeable base layers. Also CertiPur certified.
http://www.plushbeds.com/memory-foam-mattresses.html They are a factory direct manufacturer and make several memory foam mattresses that use 4 lb gel memory foam along with 2.5 lb polyfoam and latex (in some of their models). Their memory foam and polyfoam is also CertiPUR certified.
http://www.selectfoam.com/ They used to be a member of this site but their membership has been terminated. See the warning posted in this topic.
All of these represent good value and options IMO. As I am able to talk with more that I believe offer good quality memory foam options, I will add to this list.
For those who are also interested in non memory foam options as well there is a list of the members of this site which specialize in online sales in post #21 here who all compete well with the best in the industry in terms of their quality, service, and value as well as the help and guidance they offer to their customers.
Phoenix