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We're planning to accept STEEM/BSD in the near future, but currently we do accept 35+ different coins and you can easily swith STEEM into LiteCoin or any of them and then use that coin to purchase.

I believe they do accept steem already. They are on the list of businesses that accept steem for payment :

Coin Marketplace

STEEM 0.15
TRX 0.12
JST 0.025
BTC 54140.93
ETH 2422.15
USDT 1.00
SBD 2.12