How to buy rats Ordinals?

Could you please elaborate on the process of purchasing rats Ordinals? I'm interested in understanding the steps involved and any potential challenges or considerations I should be aware of. Are there any specific platforms or exchanges that cater to the buying and selling of rats Ordinals? What form of payment is typically accepted, and are there any fees associated with the transaction? Additionally, what security measures should I take to ensure a SAFE and secure purchase? Thank you for your guidance.