The daily newspaper Haaretz today describes the excahnge rates available at the airport from banks, the post office and a firm called Global Exchange. The last company exchanged 100US$ to 305 shekels (comission 21 shekels, excahne rate 326). The banks gave 352-362 and the post office 385. Eueros were not better. Use the ATM machines or the post office. In town you'll get 387. Global Exchange gave for 100 Euros 371 shelkels, the post office 481, in town 485.