I'm in the U.S., but from what I have read Amazon might be a good starting point as they ship world-wide.
Also try
http://pcpartpicker.com
Theyhave a selection of etailers you can buy from. Open the page and on the top right corner choose your country.
Best of luck; Please post your build here when you get it selected. Do that before ordering/purchasing and the forum members may make some suggestions, either for better parts, better performance or to save money.