Since the ICO ended years ago, you can no longer "buy the Tezos ICO." Instead, you must purchase the native token, (also known as "Tez"), on the secondary market. How to Buy Tezos (XTZ) Today

How to Buy Tezos (XTZ) Safely: A Step-By-Step Guide * Debit/Credit Card. * Google Pay/Apple Pay. * Binance P2P. * Binance Convert. Buy Tezos - The guide to buying XTZ today. - Kraken

If you missed the 2017 ICO, you can purchase XTZ through major cryptocurrency exchanges and platforms: Buy Tezos - Easy Guide to Buying XTZ Now - Binance

The Tezos Initial Coin Offering (ICO) was a historical crowdfunding event that took place from . It was one of the largest ICOs at the time, raising approximately $232 million in Bitcoin (BTC) and Ethereum (ETH).