Insulating Foam Gaskets - Outlets & Light Switches $0.20 Safety Caps Outlet Plugs $0.20 Air-Tite Switch Cover (Single Gang) $2.20 Air-Tite Wall Outlet Covers (Single Gang) $2.45 Cardinal Foam Insulated Outlet Covers $2.55 Air-Tite Outlet/Switch Cover $2.70 Air Tite Double Gang Insulated Light Switch Covers $2.70 Air-Tite Double Outlet Cover $2.95 Lessco Air Vapor Barrier Box $3.20 Lessco Air Vapor Sealing Boxes, Case of 60 $191.00 Duck Socket Sealers $2.12