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Carnation

Electrical - Dual wall box

Carlon - 2-Gang 32 cu. in. New Work Electrical Boxes

Electrical Box 2G 32 cu in Carlon 

In-store they are $0.98 each.

http://www.homedepot.com/p/Carlon-2-Gang-32-cu-in-New-Work-Electrical-Boxes-50-Pack-B232ACP/202843352        Box of 50 for $47