Amazon.com : NEMA L6-30 Extension Power Cord - 30A/250V, 10 AWG - Iron Box # IBX-5803-25 (25 ft, Molded) : Electronics Power Cables : Tools & Home Improvement
Amazon.com: NEMA L6-20 Extension Cord - 20A/250V, 12/3 SJOOW - Iron Box Part # IBX-4803 (6 ft, Build) : Tools & Home Improvement
HDX 9 ft. 12/3 20 Amp 250-Volt Air Conditioner Extension Cord, Grey HD#188-327 - The Home Depot
100A 125/250V Marine Shore Power Extension Cord, Yellow – Amp Up Marine & RV Cords
Tripp Lite Power Extension Cord, C19 to C20 - Heavy-Duty, 20A, 250V, 12 AWG, 15 ft. (4.6 m), Black - power extension - P036-015 - Power Cables - CDW.com
AC WORKS Heavy Duty Durable Extension Cord (50FT NEMA 6-20 20A 250V) - Amazon.com
Welding Extention Cord 50' 50 Amp 250V for sale (DWC83STBLK50) - Welding Supplies from IOC