Israeli app Shopnfly informs travelers on where to get the lowest prices on duty free shopping. At the airport, on the plane or duty paid in the local supermarket. Shopnfly is in use in nearly 50 airports and has just partnered with El Al.

http://www.timesofisrael.com/israeli-app-lets-travelers-deep-dive-duty-free-pricing/

https://www.shopnfly.com/ https://www.youtube.com/watch?v=OMuXpFTyvyw