I"ve changed money in the baggage hall and gotten good rates. ( changed last in July) BUT, don't change before arriving in Israel. Not a good idea. BTW the bus is a terrible idea. I've been on the 947, which is one of the buses that stop at El Al junction. These are not buses whose route is dedicated to the airport. There have been times the 947 just drove past, unable to take on any passengers because it was full to capacity. ( and no one got off to make room)