USW 12/3 Yellow Pow-r Block Triple Tap Extension Cords 100-ft 12 / 3-Prong Outdoor Sjtw Heavy Duty General Extension Cord in the Extension Cords department at Lowes.com
Woods 8 ft. 16/3 SJTW Tri-Source (Multi-Outlet) Yard Master Outdoor Extension Cord 2466 - The Home Depot
Milspec 25 ft. 12/3 ProPower Triple-Tap Heavy Duty Extension Cord