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Buy what? A downvote? Send 10 SBD to @nokodemion and I will downvote you for 9 cents.

I'm new too. I do know how find a place to buy I normally go to coinmarketcap. They maintain a good list of coins here is steem markets. Make sure you check the wallet of the exchange your getting it on before buying. I notice poloniex has its wallet suspended and haven't checked other exchanges yet.
https://coinmarketcap.com/currencies/steem/#markets

Binance or Bittrex