Buying a cheap mattress online in Canada requires balancing immediate savings against long-term durability. For a queen-sized mattress that lasts at least 7 years, sleep experts recommend a budget of . Below $400, compromises in foam density and coil gauge often limit a mattress's lifespan to just 2 to 4 years. Top Budget Online Mattress Picks in Canada Where to Buy Cheap Mattresses in Canada: Real Value Guide