I'm a customer of betonline (tigergaming) and don't want to use coinbase, even through an intermediary wallet, because they can and will trace the account, so where can I sell my btc?
You can try localbitcoins, that is the usual go to of people that want to buy and sell bitcoins. Just beware of scammers though, there is a way that you still get scammed even if they deposited it on your bank account. Good luck.
Just curious though, why you do not want to use coinbase?