Carlon 1-Gang 18 cu. in. PVC Round Old Work Electrical Box B618RR - The Home Depot
Carlon 1-Gang 14 cu. in. PVC Old Work Electrical Switch and Outlet Box B114RB - The Home Depot
Carlon 1-Gang 14 cu. in. PVC Old Work Electrical Switch and Outlet Box B114RB - The Home Depot
Hubbell 1-Gang Gray Aluminum Weatherproof New Work/Old Work Standard Rectangular Exterior Electrical Box in the Electrical Boxes department at Lowes.com