You can get Golan from any BUG electronics store in Israel (there's one in the Mamilla mall in Jerusalem, not sure about whether there's one in Ben Gurion). Or, you can order it ~2 weeks ahead and have it shipped to where you'll be. Either way, its 49 shekel for the sim card and then 59 shekel per month for the plan, which is much cheaper than the rental places. And contrary to what might have existed in the past, Golan takes an American CC and a passport as a form of ID.