Woods 15-ft 16 / 2-Prong Indoor Spt-2 Light Duty General Extension Cord in the Extension Cords department at Lowes.com
Amazon.com: Cable Matters 2-Pack Polarized 18AWG 2 Prong Replacement Cord Lamp Wire 8 ft - NEMA 1-15P to 2 Wire for Lamp Cord Replacement with Plug : Tools & Home Improvement
Amazon.com: 18 AWG 6Ft Replacement Lamp Cord with Open End, Polarized Molded Plug, 2-Prong,2-Wire Appliance Power Tool Cord with Open End,15A/125V AC 3 Pack : Tools & Home Improvement
White Lamp Cord 18/2| SPT-1| 250 ft. spool | Parallel Lamp wire
SPT-3 14/2 SPT-3 Lamp Cord | Allied Wire & Cable
How to connect 3 pin plug with 2 wires - YouTube
electrical - Do I need a 3 wire cable between light fixtures? - Home Improvement Stack Exchange