Thanks guys for the answers, i expanded my research and i found that miner work only on 2 coins ( SiaClassic and SpaceCash) which I am not interested.
I do not promote the site but it was the first one I found that sell this type of asic.
I will focus on another type of asic, don't know what right now but still doing my research.
Your best change is to buy it from here (selling hardware section) using forum escrow, or on ebay with trusted members and ebay protection (DONT EVER PAY WITH CRYPTO ON EBAY THAT IS 1100% a SCAM). You can find the Obelisk SC1 for 1.7k (which mines the SIA fork, so you could actually mine SIA, and the original fork, in case you want to mine SiaClassic and SpaceCash).
Good luck!