Where can I buy Omni tokens?

Could you please elaborate on the various avenues available to purchase Omni tokens? I'm particularly interested in understanding the different platforms or exchanges that offer these tokens, as well as any specific steps or considerations I should be aware of when making such a purchase. Additionally, I'd appreciate any insights you have on the reputation and reliability of these platforms to ensure a SAFE and secure transaction. Thank you for your assistance in guiding me through this process.