If you want That's 8x DVD-R (Gold), you have two choices.
1) Ordering from Japan
Most Japanese online shops will not ship to other countries. This means that you will have to use a remailing service such as DankeDanke (koba mentioned this once).
You can then order from virtually any Japanese online shop such as START Lab, Amazon...
Disadvantages: Shipping is expensive, media is expensive (a 10 disc cakebox costs 900 Yen, which is about $7.77).
2) Ordering from Greece
It is also questionable whether Greek online shops ship to other countries. I don't know any Greek remailing service.
Many Greek online shops such as Grammi, Media-Shop, CD Market, E-SHOP, Newtechlabs have That's 8x DVD-R (Gold) in stock.
The lower price (somewhere in between â‚¬ 4 and â‚¬ 5/$5.24 ~ $6.55), is a clear advantage, even more if you purchase in large volums, but you have to find a Greek online shop that will ship internationally.
Good luck, kamen555!