The fees associated with depositing and withdrawing depend on the blockchain network activity. A congested network means that gas costs will be higher. We suggest checking previous deposits as a reference via our Telegram Bancor Alerts channel and keeping an eye on Etherscan's tracker or gwei.at for periods of low gas costs. A congested network means that gas costs will be higher.
For trading fees, you can see current proposal to set the pool's fee here.