Buying a coop and run
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i have some photos of chicken coop/run for you from petsmart and costco for references
12 chickens.. most prefab i saw are up to 8 chickens though. .you might need go to other places or build your own ..
remember that these pre-fab like to inflate the number of chickens their coop/run can hold.. so up to 8 is probably best for 5-6 chickens at the most..
there are people building coop/run for sale on craiglist as well .. even farms will build their own and sell if you are interested