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
Extension Cord Safety: A Comprehensive Guide - Roman Electric
Maximm Extension Cord 6 Feet Flat Plug/Wire, Multi Outlet - 3 Prong Angled Plug Extension Cord - White UL Certified - - Amazon.com
DIY Portable Switched Power Outlet With Extension Cord : 8 Steps (with Pictures) - Instructables