Game panels with game netting over the top will contain them fairly cheaply, but they'll need foxproof housing. We bought a cheap basic 6 x 4 ft shed kit, put in a half-round fence pole perch and cut ventilation holes in the apex at both ends (chicken wired to prevent wild birds entering). This did perfectly well for one of our breeding quartets of Narragansetts over the summer. We built the shed onto skids so we could move it around the field to fresh pasture and creosoted the whole thing and it's going strong three years later.