You're right about that. Craigslist or FB marketplace old wheelbarrow to use to make a chicken tractor. PVC pipe or electrical conduit and chicken wire for light and portable one. A lot of them will try and dig under so you have to watch for that but you can use wire on the ground if they do. I used scrap wood that I was glad to get rid of. You can also use cull lumber since it doesn't need to be perfect dimensional stuff for a literal shanty.