[HeyLaughingBoy]

A little OT, but I've found that it's better to make your own extension cables. I have a 1kW tank heater that is about 100' from the closest outlet. The cost of 100' of 12gauge house wiring and a plug, socket and outdoor outlet was much less than even a cheap 100' extension cord and has much less voltage drop.

[noonespecial]

That depends on your application. Extension cords are more expensive because they are made of stranded wire that remains flexible and resists breaking. Household wire is solid and not meant to be rolled and unrolled repeatedly. It will get kinks and weak spots. But if your application is for a relatively static run, left in place for a long time, the household wire is better.