Eaton 660-Watt Plastic Keyless Ceiling Socket, White in the Light Sockets department at Lowes.com
Pilarmuture 2Pcs E27 Screw Base Round Plastic Light Bulb Lamp Socket Holder Adapter,Screw Light Bulb Holder Base Sockets Base Night Light Bulb Base Lamp Replacement Base for Holding Bulb(White) - Amazon.com
Leviton 600-Watt 250-Volt White Outlet Box Lampholder R50-49875-000 - The Home Depot
Keyless Plastic Lamp Holder 5" Blk/Wht Conductor
Keyless Porcelain Lamp Holder, One-Piece Medium Base, 660W
Leviton 660-Watt Medium Base Single Circuit Keyless Outlet Box Mount Plastic Incandescent Lampholder, White 8829-CW2 - The Home Depot
Plastic Lamp Holder, Pull Chain, 1-Piece Medium Base, Outlet Box Mount (2-Pack)
E17 Socket White Plastic Rectangular Lamp Holder Edison Screw Wiring Base [3PCS] | eBay