In Greece, for islands of the prefectures of Lesvos, Chios, Samos, Dodecanese, Cyclade and for the islands Thasos, Samothrace, Northern Sporades and Skyros, apply a reduced VAT of 30%, rounded to the nearest unit.
A program that calculates the final price of products for these islands, from pricelists issued for the rest of the greek territory is if anything useful.
Here is a tiny solution, written in C# and targeting the .NET framework. Distributed under the terms and conditions of GNU GPL License
For more information see at my Google’s Project Hosting Homepage for BorderlandVAT
or can directly download the release archive from my box.net folder