Is there anything worth buying in Canada?

we currently have an Ikea Malm full-size bed + Ikea MATRAND mattress, which is foam/latex that I believe has something to do with me waking up sweating almost every night (the second one, previously was coiled that I hate). We want to switch to a king size (we finally found someone to buy this bed) and I'm getting crazy with overwhelming info on buying a mattress and lack of options in Canada. We do like the firmness of this Ikea mattress (medium firm) but I sleep on my stomach/side and him on his back/side, so for me is a little bit of bother. I was looking the bed-in-box options we have here (Douglas, Silk+Snow, Novosbed) and I some brick and mortar stores (I hate sales reps and their tactics) but still have no idea what is good. Does anyone have recommendations?