What do you think should i Invest and how much money will i make per day If i dont pay electricity !! I dont need to pay electricity in my country at all what kind of hardware should i buy and how much will I earn for day
If you insisted on buying retail then you would likely want to buy from bitmantech as antminers tend to be the cheapest on a per GH/s per $ basis (they also are very efficient on a GH/s to watt basis in the event that you will need to pay for electricity in the future).
I would also suggest that you build your own mining hardware as you should be able to do so with that large of a budget