Champion Power Equipment 50-Amp RV Generator 30-ft / 1 3-Prong Outdoor Heavy Duty Locking Extension Cord in the Extension Cords department at Lowes.com
Houseables Generator Extension Cord, Electric Wire, 3 Prong, 30 Amp, 250 Volt, Single, Black, 25 Ft, All Rubber, 10 Gauge, Heavy Duty, L6-30, Commercial, Electrical Power Cable, with Locking Switch - Amazon.com
VEVOR 30 Amp Generator Cord 4 Wire 10-Gauge 40-ft / 4 3-Prong Outdoor Sjtw Heavy Duty General Extension Cord in the Generator Accessories department at Lowes.com
30 Amp 3-Prong NEMA L5-30P/L5-30R RV Generator Extension Power Cord – Tooliom
MaxWorks 80843 25 Ft. 30 Amp 3-Prong Male Twist Lock to 15 Amp Female Triple Outlet Generator Extension Adapter - Walmart.com