SHAT-R-SHIELD, Lamp Holder, Medium Screw (E26), Lamp Holder - 36WH47|WATER TGHT SOCKET SM BSE W/SL - Grainger
E27 Extension Lamp Holder 4cm Lampholder Led Light Holder Base Socket 30pcs - Lamp Bases - AliExpress
MOES WiFi Smart Lampholder|Lamp Holder Adapter Light Bulb Socket
Leviton Socket with Outlets, White R52-01403-00W - The Home Depot
Amazon.com: Bahong Smart WiFi Light Socket,Smart Home Mini Socket,E26/E27 Lamp Bulb Adapter with APP Remote Control Timer,Wireless Remote Control Lamp Holder,Only Support 2.4GHz Network (1PC) : Industrial & Scientific
Bakelite Socket Adapter Pull Chain Lamp Holder with Two Outlet - China Bakelite Lampholder and Lamp Holder