Hello can someone tell me where can I buy a reliable antminer s9 or sth simular to this?
Dude it's going to be very difficult for you to be able to buy a s9, it dropped like a bomb in the community and was quickly absorbed, the sites that sold it were cleaned up very quickly. And other sites that still have it in stock are selling for an inflated amount.
Here in my country for example I have seen people selling the used mining company for 5 thousand dollars, I suggest you wait to pass this hype around the S9 and buy it in the near future for a reasonable value.