If you had bitcoins stored in a local wallet on your device, then you already have it. If not than there are some exchanges that support it. People are mentioning Bittrex here and I think ViaBTC supports it as well.
Bittrex is having a very huge volume when it comes to BCH and so is the reason it is mentioned and kraken is having the second largest volume ,even if you have the coins in your wallet you cannot deposit it in these exchanges for now as they are yet to enable the deposit and withdrawal process.Just waiting for some time to see what direction it will be going.