Woods 25 ft. 14/3 Multi-Outlet (3) Garden Outdoor Medium-Duty Extension Cord, Green 3030 - The Home Depot
Permanent Extension Cords
Don't have enough power outlets? Here's what you can do - CNET
Turtles and Tails: DIY a Built-in Extension Outlet
Projex Indoor 3 Ft. L Orange Extension Cord 14/3 : Target
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
I'm adding an outlet using this diagram. Is this the best way? : r/askanelectrician
15' Extension Power Cord w/ ON/OFF Foot Press Switch - Green Cord - 3 Outlet Cube Tap - String Lights Accessories
DIY Portable Switched Power Outlet With Extension Cord : 8 Steps (with Pictures) - Instructables