Electrical Box, Masonry, 1 Gang - Electrical Boxes - Amazon.com
Hubbell WIRING660 662077 Handy Box with Single Gang, Six 1/2" Knockouts and 1-7/8" Deep: Electrical Boxes: Amazon.com: Tools & Home Improvement
Steel City 1-Gang 20 cu. in. New Work Adjustable Metal Electrical Wall Box MB120ADJ-6R - The Home Depot
4x2 Inch Utility Size Single Gang Electrical Box, Drawn Construction, Outlet Box, Handy Box, Ten 1/2 Inch Knockouts, Raised Ground, 13 Cu. in. Capacity, 1-7/8" Deep, Galvanized Steel - Amazon.com
Steel City CXWV 18cu.in Gangable Steel Switch Box with Clamp | Cooper Electric