Pololu has distributors all over the world, so there's a good chance you can find this robot locally. Here are just a few examples of European resellers that carry it:
http://www.robotshop.com/en/zumo-tracked-robot-kit-arduino-no-motors.html
http://europemodels.eu/p_5809_ZUMO+Robot+Kit+for+Arduino/
You can find a full list of distributors here:
- Ben