Projectpak Double Bulb Socket, 2-Light Twin Cluster Socket, Incandescent Lampholder, Medium Base E26 Phenolic Double Light Socket, with 1/8 IP Bracket, Wire Leads - Amazon.com
Wyze Lamp Socket – Wyze Labs, Inc.
E26 to 2 Outlet Socket Adapter Light Holder Splitter,UL Listed Standard (Medium) E26 Base Light Bulb to 2-Prong Outlet Plug Splitter Converter,Pull Chain Switch (1-Pack,White) - Amazon.com
12 Volt Light Bulb Socket with 8' Wire - On Off Switch for Low Voltage Lighting E26 Medium Base DC 2.1MM Male Plug 12V 6V 24V Battery Power Bank Portable Camping DIY
3 Prong Light Socket Adapter, E26 Light Bulb Outlet Adapter, Polarized Light Socket to Plug Adapter, Light Bulb to 2/3 Prong Outlet Plug Splitter Converter for Garage Porch CCTV Camera (White) - Amazon.com
Legrand 60-Watt Porcelain Pull Chain Ceiling Socket, White in the Light Sockets department at Lowes.com
Leviton Socket with Outlets, White R52-01403-00W - The Home Depot