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blocktrades.us works good for that.. you can trade for BTS and then transfer BTS to blocktrades and turn it into STEEM

both STEEM and SBD deposits/withdrawals have been disabled for months, they call it maintenance...
It's one of the few bad things about OpenLedger

Funny as per usual, they come up with all these things you have to do to make it work, and then don't tell you about it :/

nor does Poloniex right now.