Where can I buy BTT old?

As an individual interested in cryptocurrencies, I'm wondering: where exactly can I buy the old version of BTT? I've heard it's still available on some exchanges, but I'm not sure which ones specifically. Could you please provide me with a list of reliable platforms or exchanges that still offer the older iteration of BTT for purchase? It's important for me to know this information to ensure I'm making a safe and informed investment decision. Thank you for your assistance in this matter.