2 Outlet Light Socket Adapter, E26 Bulb Socket to Outlet Splitter,Converts Medium Screw Socket into a Socket with Two outlets,Polarized Outlet,with Pull Chain Switch. UL Listed, White (2-Pack) - Amazon.com
Project Source 660-Watt Off-white Medium Light Socket Adapter in the Light Socket Adapters department at Lowes.com
Leviton Glazed Porcelain Lamp Holder with Pull Chain and Outlet R60-09726-00C - The Home Depot
Willkey Light Socket 1250W Heat Resistant E26/E27 to 3 Prong Polarized Handy Plug, Easy to Install, Convert Light Bulb to Outlet Socket Adapter - Walmart.com
briteOWL® Power Failure LED Light Up Outlet Cover, Unaffected by Electrical Outage, Emergency LED Backup Lighting for Home Power Failure, Optional Dusk to Dawn Lighting, Duplex White Plate - Amazon.com