Hi Damian,
Welcome to the Mattress Forum! 
I’m sorry to hear about your reaction to our memory foam mattress. Many people are sensitive to polyfoam and specifically memory foam (I once had a similar reaction to a memory foam topper, even though I don’t have Multiple Chemical Sensitivities (MCS)). If you are very sensitive to odors, as some people are with Multiple Chemical Sensitivities (MCS), an odor, even one that isn’t harmful, can be unpleasant.
“Toxic” is a term for poisonous substances produced within living cells or organisms, although the term is often used in the mattress industry (and often part of some “fear-mongering” campaigns). Most people that are looking for “non or less-toxic” (toxicity is dose-dependent) materials are usually concerned most with “safety”.
There is quite a bit of confusing information available online about toxicity, safety and organic, and there is more about the different types of organic and safety certifications such as Oeko-tex, Eco-Institut, Greenguard Gold, C2C, and CertiPUR-US in post #2 here, and more about some of the differences between organic and safety certifications in post #2 here and there are also some comments in post #42 here that can help you decide whether an organic certification is important to you for environmental, social, or personal reasons, or whether a “safety” certification is enough, and what those certifications can mean to determine whether the contents of any particular mattress are “safe enough” for you.
I’ve narrowed my choices down to these models:
- Nature’s Embrace “Unison” GOLS Certified Organic Latex (2" medium Dunlop + 6" firm Dunlop) + organic cotton cover and
a wool layer, $1995 CAD, tax and shipping included. - Green Sleep “Pure Support” , 6" North Malaysia 600 natural rubber + organic cotton cover and a wool layer, $2644 CAD, tax and shipping included.
So far I’m leaning towards Unison, the price is really good and apparently they use organic latex while the other two use natural? I find it a little odd that Unison is the cheapest of the three. Can anyone offer some insight/advice?
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All three of the items you’ve listed use good quality and durable materials. The Dormio and the MFC mattresses would be a bit more comparable to each other than the Green Sleep. There is some difference in the cover and the organic certified wool in the Dormio which can account for a bit of the price difference, but overall there are many factors involved in pricing a mattress. While price is certainly important of course, the “value” of a mattress purchase is what is most important and price is just one of many factors that can affect the “value” of a mattress purchase. There isn’t a “formula” that can be used to assess or “calculate” the value of a mattress because there are so many different variables and criteria involved that can affect the price of a mattress that can each be more or less important to some people and not to others who may have completely different criteria or definitions of “value”. The value of a mattress purchase is also relative to how a mattress compares to the other finalists you are considering or to other mattresses that are available to you in your area (or online if you are also considering online options). There are many reasons that a mattress that may be “good value” for one person or in one area of the country may not be good value for someone else that has very different needs and preferences or that lives in a different area.
You can also read in the links I provided above the difference between “natural” Dunlop and GOLS certified Dunlop, which in many cases can be the exact same or an extremely similar product (both being 100% NR Dunlop). I would consider both of these types of latex to be quality materials and the choice between on that had a GOLS certifications versus one that didn’t more of a personal versus quality preference.
Before making any final decision, I would have a detailed phone conversation with any manufacturer you’re considering to avail yourself of their assistance in not only learning about their products but also for assistance in selecting a configuration that they think would best suit your needs. Both Dormio and MFC are members of this site which means that I think very highly of them and that I believe that they compete well with the best in the industry in terms of their quality, value, service, knowledge, and transparency. They are extremely knowledgeable about latex and different configurations.
Phoenix