Where can I buy ChatGPT?

Could you please elaborate on the availability of ChatGPT for purchase? I've heard much about its capabilities and am interested in acquiring it. However, I'm not sure where to start looking. Is it sold through a specific website, application, or marketplace? Additionally, are there any prerequisites or restrictions that I need to be aware of before attempting to make a purchase? I would appreciate any guidance you could provide on this matter as I am keen on exploring the potential of ChatGPT.