You will not be subject to transfer fees, but check the terms of the casino you contact and your bank for details on any possible rules. You're more likely to pay a fee if the total is small enough. There are also limits to how much you can transfer to a casino at a time, plus you might be restricted in how much you can send to a bank account at a moment when withdrawing funds. Each casino and bank should provide details on what limits work, so check their terms first.