If you have to get something from Tractor Supply, I would buy one of their dog houses and convert it. Like this one...
https://www.backyardchickens.com/t/44/texas/23310#post_12858425
The Dog house is $139.99, the nesting box is $9.99, and a dowel rod and hangers for a roost is less than 5 bucks at Home Depot.
https://www.backyardchickens.com/t/44/texas/23310#post_12858425
The Dog house is $139.99, the nesting box is $9.99, and a dowel rod and hangers for a roost is less than 5 bucks at Home Depot.