I heard BCC will have rate about $300 - $400, but I dont know this is true or just an issue
How BCC can be on exchanges when officially still is not available? Those are the tokens redeemable on exchanges in 1-1 ratio. Early speculators can play now. If this price stays many people will rush to sell their gift 300$ wont hold long! I will stick with BTC in every case!
In currently, have 2 exchanges support and listing Bitcoin Cash, they are ViaBTC and HitBTC, you can check it on coinmarketcap:
https://coinmarketcap.com/currencies/bitcoin-cash/#markets