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 - Newegg.com
Amazon.com: RVGUARD 4 Prong 30 Amp 75 Foot Generator Extension Cord, NEMA L14-30P/L14-30R, 125/250V Up to 7500W 10 Gauge SJTW Generator Cord with Cord Organizer, ETL Listed : Automotive
AC WORKS 50ft NEMA L5-30 Cord 50-ft 10 / 3-Prong Indoor/Outdoor Soow Heavy Duty Locking Extension Cord in the Extension Cords department at Lowes.com
DUROMAX 50 ft. 10 Gauge Portable Generator Single Tap Extension Power Cord XPC10050A - The Home Depot