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OpenLedger currently has the asset open.steem which can be bought/sold on the following markets.
open.STEEM:BTS
open.STEEM:open.BTC
You can also search for any open.steem market using the "Find Markets" option on the top right side of the exchange window.

You can also buy sell steem using blocktrades or bittrex

you can buy STEEM on BlockTrades too

You can buy steem and steem power directly on steemit. When you are logged in there are three bars on the top right of your screen, which are a button to a menu. One of the entries is "Buy Steem Power". When you click on it there is a nice menu that lets you buy steem and steem power directly.

I just bought 1btc worth this way.

I have now idea if that gets you a good price, but it sure is simple.

I just bought 1btc worth this way and the site tells me that my steem power up that i bought are worth less than 1/2 of one bitcoin. so be careful with this approach

Click on the steemit logo in the upper left, or Bitshares

Thanks for all the responses homies!

I saw on OpenLedger over the past couple of weeks a huge surge in STEEM price. I definitely expect this to continue. Anyone have any concept of what a leveled off value of STEEM may be in da future?