Look up Steem coin price and you will find the places to buy Steem. You can buy both Steem and Steem power from your profile page. I have not tried that method yet. Another way would be to buy Ethereum cloud mining from someone like Genesis mining and set it to mine Steem. Hope that helps. If you desire to mine it let me know I can provide you a code to genesis that would benefit both of us by 3% of your purchase.