Don't think about it where to bu bitcoin with the least amount of fee, think about it where to buy bitcoin with the most secure way, people really try so hard saving up a dollar or too and they end up being scammed because of it so they go on these shady websites and the get scammed and than they start complaining about it, my advice for you don't risk your money and go around looking for a way to buy with less fee, just go and buy from coinbase or any other trusted websites, they difference in the fees is not that high to be taken in consideration.