Where can I buy Polis tokens?

Could you please clarify for me where and how I can purchase Polis tokens? I've heard a lot about this cryptocurrency and its potential, but I'm not sure where to start. I'm particularly interested in the security and reliability of the platform I'm purchasing from, as well as the ease of use and available payment methods. Additionally, I'd like to know if there are any discounts or promotional offers available for new investors. Thank you for your assistance in navigating this process.