»What's the best iron golem farm on Survival

As the topic, I've researched alot of Iron Golem farm and I can't see any of those would be very efficent....you know I ain't going to waste couple of hours just to get 30 iron ingots per hour... (according to Nims IG Farm)... Can anyone suggest for me any low-cost IG Farm that can make alot of iron ingots????What I meant low-cost means low cost of money....