SHELLTON 3-Pack Plug in Light Socket,E27 Light Bulb Socket Adapter, Lamp Socket Extender Adapter,Extension Lamp Bulb Holder with On/Off Switch US Plug - Walmart.com
STBTECH E27/E26 Plug in Light Socket Adapter with On/Off Switch, Flexible Neck Extension Lamp Bulb Holder Converter for Night Light Bedside lamp Wall lamp Bases - Amazon.com
Instrument Lamp Holder, LED Bulbs Holder LED Instrument Lamps Socket LED Bulb Base Extension Cables Green Rubber - China Holder, Auto Fuse | Made-in-China.com