parkworld 8 in. 12/3 SJTW 3-Wire Household Regular 15 Amp Plug 5-15P to L14-30R Generator 4-prong 30 Amp Receptacle Adapter Cord 885477 - The Home Depot
Firman Generator Cord in the Generator Accessories department at Lowes.com
parkworld 2 ft. 12/3 3-Wire 20 Amp 125-Volt NEMA 5-20P to L14-30R Generator Adapter Cord 886672 - The Home Depot
VEVOR 30-Amp Generator Extension Cord, 25 Feet, 125V 3750W Heavy Duty Generator Outdoor Power Cord, NEMA L14-30P / Four NEMA 5-20R STJW Flexible Power Cable with Twist Lock Connectors, for Generators