You can build a coop or something like a hoop tractor for very little or even free, for example with pallets, or you can spend thousands on a good looking, good sized coop. There really isn't a way to answer that.
Thanks for responding, Judy, but I wasn't asking about the cost of the coop...
Yesterday I attended a talk at my local Agway about raising chickens, and it was interesting and seemed pretty easy. I have a large fully-fenced garden and thought I might build the coop and run inside that to protect from predators. My garden supplies lots of food but chickens would add...