I have been in the Ben Gurion International Airport Duty Free on march 2013, this is the prices that I saw:
Electrical products
Mobile computers
Lenovo starting from 500$.
Lenovo 580 780$
Asus K55V 899$.
Asus starting from 600$.
For the Kitchen
Kitchen Aid 1790 NIS.
KMIX 1400 NIS.
Magi mix 200$
Games
PlayStation 12GB 319$.
Mobile Phone
iPhone 5 16GB 799$.
iPhone 4 8GB 399$.
Samsung GALAXY S4 729$
Samsung GALAXY S3 499$
Cameras
Canon SX500 349$.
Canon SX50 569$.
Duty free sport:
New balance 990 200$.
New balance 574 120$.
Asics GT2160 130$.
Saucony hurricane 15 169$.
Those are leading shoes; there are other shoes with lower prices.
Perfumes
Gucci pure home 80$ (90 m"l).
Lacoste verd 60$ (100m"l).
Dolce & Gabbana The one for men 85$ (100 m"l).
Dolce & Gabbana The one for women 105$ (75m"l).
Lady Gaga fame 55$ (100 m"l)
Montblanc legend 67$ (100 m"l).
L'eau Par Kenzo for women 77$ (100 m"l).
Cigarettes
Marlboro 52.90$.
$Winston 46.90.
Fashion
As usual in duty free the fashion on been gurion airport is mainly high prices.
Food and drinks
There are 3 cofee shopes on Ben Gurion duty free:
Si espresso, Aroma and Arcaffe. The first tow has a little bit cheaper prices.
If you want more "hard food" there are few fast food places like: pizza hut, shipode htikva (were you can get falafel and meat) and burger runch (something like McDonald).
There is also a soshi place called IFRAME.
All this places are close and you can easily see them.
Example for food prices:
Sandwich 30 shekels, half 19 NIS.
Espresso 10-12 NIS.
Falafel 24 NIS.
Tovleron 400 gram 13$.
if you are travelling to frankfurt germany then do not buy cigarettes at ben gurion airport. the current price at ben gurion is 65$ for 1 carton marlboro. at frankfurt airport at the tiny duty free for elal flights its only 43 euro