I'm on the verge of buying a double mattress for my son's room. We've upgraded from single to double bed for him. He'll be off to Uni in a bit over a year, so then it will be his room/spare room. Am a bit shocked at mattress prices. I want natural fibres, not memory foam, pocket sprung. I'd like to support our local independent shop. They've got a mattress for £500. My DH says I should shop around online and find one cheaper. But will I? I don't mind spending a bit more to support a local shop. I'm also wary of buying a mattress online. Or will I save £hundreds? Is £500 about standard for a double mattress? My son probably won't notice too much what he sleeps on!