Hi Christine,
The first place to start is the tutorial post 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.
It also includes a link to a list of some of the better online memory foam options I’m aware of and a link to a list of some of the better online manufacturers and retailers that ship across Canada.
Some of the better options and possibilities I’m aware of in the Toronto area are listed in post #1 here.
The FTC challenged the “no VOC” claims because anything over background levels (that aren’t defined) can’t claim no VOC’s. You can see some of my comments about the FTC action here. You can also see some of my comments about Relief Mart and their mattresses in post #9 here.
Phoenix