Hi sandimac,
Just in case you haven’t read it already … the first place to start your research is post #1 here which has all the basic information, steps, and guidelines you will need to make the best possible choices.
You can read more about ZedBed in post #2 here
You can read more about Essentia in this thread and in this thread and post #3 and #4 here about their false claims would be worth reading as well. They certainly have some inaccurate information on their site and make some claims that are misleading and aren’t accurate at all about their mattresses and are also not good value.
Some of the better options I’m aware of for retailers and manufacturers that ship across Canada are listed in post #21 here.
If you let me know your city or postal code I’d also be happy to let you know of any of the better local options I’m aware of that are near you.
Phoenix