8/3-8/4 or 6/3-6/4 8 Gauge 6 AWG SOOW Cable Wire Cord Portable Power 600V USA | eBay
6/4 SOOW Black Portable Power Cable 600V Non UL | Nassau Cable
AC WORKS NEMA 6-20 20A 250V 10-ft 10 / 3-Prong Indoor/Outdoor Soow Super Heavy Duty General Extension Cord in the Extension Cords department at Lowes.com