Back Again, HDX 50 ft. 16/3 Light-Duty Indoor/Outdoor Extension Cord (3-Pack) $7.85. 6-Pack $15.70 At Home Depot. Free Ship $45 Or Pickup In Store. By admin | January 13, 2020 8:00 pm EST 0 Comment Quick, they sell fast.- HDX 50 ft. 16/3 Light-Duty Indoor/Outdoor Extension Cord (3-Pack).- HDX 50 ft. 16/3 Light-Duty Indoor/Outdoor Extension Cord (6-Pack).