Never Use The Casino ATMs
ATMs are conveniently placed all over inside the casinos and this is done on purpose. These machines usually charge a sizable fee on top of fees that your bank usually charges so if ever you find yourself in need for some cash, you should look for an ATM off the strip. A service fee can range from $5 to $35, depending on the venue and desperation of the gambler needing some fast cash.
A great idea is to have a free checking account with Charles Schwab. They will refund you for any ATM free you are charged! (please verify this with CharlesSchwab.com as this information may be out of date by the time you read this)