You can buy it on yobit.net and also to bittrex. But if you want to have some other choice of where you can buy Bitcoin cash, visit the link
http://www.altcointoday.com/exchanges-and-wallets-supporting-bitcoin-cash/And it's not "BCC" because it's bitconnect and they are two different alt coins. It's abbreviation it's BCH not BCC. And transferring them to bitmain, just follow their instruction on your email notification coming from them.
It was an old thread. They said poloniex don't support BitcoinCash while they actually do.
Don't buy from yobit, you will get scammed by them