AMEX Global Travel Card ATM Fees - Does anyone know of partner banks in Spain that have free or low withdrawal fee?

Not so much a credit card question as a Travel Card question.

I have a few prepaid travel cards, NAB Traveller, Qantas Cash, Velocity Wallet, and have recently pre-loaded some EUR on to an American Express Global Travel Card.

AMEX charge $2AUD for each ATM withdrawal whilst away. However there can also be a bank fee for use of the ATM.

Does anyone know of partner banks in Spain that are fee-free for AMEX ATM use, or if not have a low-fee?