As of now, You cannot buy an Ethereum coin as you would with Bitcoin. The only way to acquire Ether is by mining for it or purchasing it with fiat currency on an exchange.
While there are plans to release physical coins, as of now there are no official Ethereum coins.
NOTE: Warning: Buying cryptocurrency can be a risky investment and it is important to understand the risks before making any purchase. It is not possible to buy an actual Ethereum coin as it is a digital currency. Investing in cryptocurrency involves significant risk, including the risk of losing all of your investment, and may not be suitable for everyone. You should always consult with a financial advisor or other qualified professional before making any financial decisions.
The Ethereum network is still in its early stages, and the team is still working on releasing a number of features. Once the network is more developed, we may see Ethereum coins being released to the public.
Until then, the only way to acquire Ether is through mining or purchasing it on an exchange.