New bed, please!

I think, by now, I've made it clear that I need to do a lot of stuff in my house. New lights, painting, some repairs...just a lot of stuff. On top of that, I need a new bed. I think those adjustable beds are so awesome but they would never fit up my stairs or through the upstairs hallway to my room. Our house is about 100 years old so the halls are rather narrow. In order to get our current bed up there, we had to fold the mattress in half and shove it through the hallway. I don't want to have to do that again. I swear that I had read something at some point about king sized beds that are actually two smaller mattresses pushed together. That would work a lot better for us. Unfortunately, I've never been able to actually find them in a store. Has anyone else heard about those?