Hyper Tough 25ft 3-Outlet Indoor outdoor Extension Cord for $4.99

It's not truly 25'. From the wallsocket, the main section is 7' and that splits into three 6' sections, each radiating out from the main cord. So at it's furthest length, it's 13'. They explain that 7 6 6 6=25, but you can only count it that way if they are linear, and these are definitely not.