USW 12/3 Twist to Lock Multi Outlet Adapter 3-ft 12 / 3-Prong Indoor/Outdoor Sjtw Heavy Duty General Extension Cord in the Extension Cords department at Lowes.com
Kasonic Outdoor, 50 Ft Extension Cord with 3 Outlets 16/3 SJTW, 3 Wire Grounded for Outdoor, UL Listed, Green - Walmart.com
Amazon.com: Maximm Extension Cord 6 ft, Extension Cord with Multiple Outlets (3 Outlets), Outlet Extender with Indoor/Outdoor SJTW Wire, Multi Plug Outlet 125V, 3 Prong Extension Cord, ETL Listed, White : Tools
12/3 Yellow Outdoor Multi Outlet Extension Cord 5 Water Resistant Covered Outlets - China Srdt Extension Power Cord and Dryer Cord 6 Foot Gray 10/3 Srdt 30 AMP 3 Prong