If you click on HitBTC B2X links on coinmarketcap, you will get 404ed. YoBit are internal trading only, you can't deposit fresh B2X onto it or indeed withdraw (I don't have any B2X on YoBit so can't confirm that you can't withdraw B2X, but I understand that is the case). The only exchange you can properly trade B2X on is Exrates, so yes the real price is $17.40 at time of writing.