You should call Triantafyllou in Athens for pricing I think he'll probably make the best price you can get here. I got mine mid-april (the first in Greece!) I bought one 4gb card 2 days ago.
Pricing for 4gb card from Panasonic (Intertech) Greece is 740€ VAT excluded, it's way to pricey but I had to get one, oh and they don't have any available right now. I'll probably buy the 8gb from the UK because it's getting ridicilus here (4gb-570€ retail-V.A.T excluded from Panasonic Europe's site) something's terribly wrong and it needs fixing.
I suggest you do some research and review your options because you'll be suprised and not in such a good way
UK market is very cheaper. I will buy all my gear from UK, pay tickets, spend at least a week around london and come back with cash in my pockets. I just don't uderstand Greek markert and never will.