Does anyone know which exchange I can buy BC coin on?
None, the only place to buy it at the moment is the casino's homepage, also same place to sell (both with quite high slippage and fee). As for how this project is going right now and how strange it started I wouldn't advise you to buy it though.
Some $BC "whale" sold so much within 20min yesterday he himself crashed the price for over 50% and once this started it wetn from 0.015 to 0.0011 real quick. There are no securities in place to prevent this from happening over and over again, so there is a high risk involved when dealing with this token.
I recommend buying and selling in the future, who knows, but just like with bets, always use an amount that you can afford to lose. That way, you don't run the risk of losing a lot of money. You end up in the situation where if you win something, great, but if not, you've lost something that you could afford to lose.
But I recommend analyzing it carefully and buying!