Replying to Camper Shells for Trucks

I just bought a 97 Dodge Dakota for pretty cheap, hoping I can keep it running long enough to last two or three winters. Anyone on here know much about camper shells, and where to look for them? I want to put one on my truck so I can sleep in it if I want but also I can keep my gear in the bed of the truck and not worry about it getting stolen because it’s locked in there. I don’t really mind buying a new one I suppose, but if I can find a used one cheap that would be rad.