From Monday 29th June at 00:01 the banks are closed, and we - the Greeks - cannot buy anything outside from Greece for two weeks now, and we don't know how much more!
How about creating a card that will be distributed on the Greek market or any... market in the world? 10, 20 and 30 euros card will be a good start. Apple already has an App Store card on Lidl Markets in Greece.
Banks are not trustworthy, make Paypal friendlier than ever...
I bet China lost so much money on its Stockmarket because of Greece's debt crisis and closed banks!
