You have 3-4 ATM's in West End but some don't accept Visa, some don't accept Mastercard and at any given time they can run out of cash or stop working. I found as long as I pulled money out before my reserves ran dry it was a non-issue. If the West End ones are acting up or are empty you can always save 30-40 lemps and take a cab into Coxen Hole and use the ones in Plaza Mar or Eldon's. Failing those you also have the airport.