Hi Kaelajane,
Some of the better options I’m aware of in the Edmonton area are in post #136 here.
Keep in mind too that it’s never a good idea no matter where you are looking to consider a mattress where there are “unknown” layers in the mattress or the retailer can’t provide you with all the details of all the layers in the mattress that you need to make a good decision. In some places a retailer will provide this for some mattresses but not others in which case it’s wise to avoid the ones where the information is not available.
Phoenix