There is this. https://uquid.com/uquid-card
you can also use this https://bitpay.com/card/ by transferring to Bitcoin first
But I understand where you are coming from that it should be offered through Blocktrades.
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There is a lot of other services like that too. But yes, there is no such service built-in the steemit blockchain. People are sometimes asking me "how to", and all usage of different services is making their head hurt. This would attract more people to steemit too. More exchanges for steem and more "fast and friendly" system for deposits and withdrawals.