Hi plasticpitchfork.
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Whether any “deal” is “worth it” or not depends on how it compares to the other mattresses you are considering based on the most important parts of the value of a mattress purchase that I linked in the last reply. I don’t know which of their mattresses you are considering or the specifics of the materials inside it but if you can find out the quality/density of the materials (see this article) I’d be happy to make some comments about the quality of the materials inside it.
They run the same or a very similar sale all the time but the name (or holiday) changes. Again … the value of a mattress always depends on how it compares to your other options … not on how it compares to a “regular price” which is often just a number that is used to make a discount look good.
You can use them to compare the type and quality of the materials to other mattresses and to the quality guidelines in post #4 here so you can make sure that there are no weak links in a mattress and to help you make more meaningful comparisons between mattresses.You can’t use specs to know what a mattress will feel like … for that you will need to talk with them or try it in person.
All of their mattresses that are listed on Amazon can be purchased from their site (which has the advantage of their return policy) … all of them aren’t specifically listed on the Dreamfoam site and I don’t see a 7" memory foam mattress on Amazon or on their site. They are completely transparent about all their mattresses so if you aren’t sure about the materials inside any of them then you can ask when you talk with them on the phone and they will let you know.
Since the most important part of the “value” of a mattress purchase is how well you will sleep on it … I would make sure that you have had a more detailed conversation on the phone with each of the options you are considering so that you are confident that the mattress will be a good “match” for you in terms of PPP. If you are looking at online options then the conversations you have with the online retailer or manufacturer will be the most important part of the process because there is absolutely no “value” in buying a mattress that isn’t suitable for you to sleep on no matter what it costs or what materials are inside it.
I read all of your post but I don’t see any other specific questions so the best general suggestion I can make is to follow the steps in the tutorial post one at a time without missing any (such as the phone call with each online option you are considering) and then once you have eliminated all the options that don’t meet your criteria or that you aren’t confident that you will sleep well on (or that don’t have a return policy that lowers the risk of trying them) then you can make your final choice based on “best judgement” and on all the objective, subjective, and intangible parts of your personal value equation that are most important to you.
Phoenix