Since the war in Gaza began, plenty of posters, stickers and leaflets in the occupied West Bank have urged Palestinians to boycott Israeli products and buy local."By us, for us," reads the slogan of the new campaign that has spread across towns in recent weeks, as calls to ban Israeli goods also grow in other countries.The slogan is everywhere at one well-known supermarket chain in the West Bank, where "Made in Palestine" fare like water, milk and toilet paper take pride of place.