Virtuemart create a xml feed for skroutz.gr , that all shops at greece are using. I think that if you make a export addond like this many people are going to get it. Because at greece skroutz.gr is the number 1 and everyone want to be there.
http://docs.skroutz.gr/feedspec/
Joomla: 1.7.3
JoomShopping: 3.2.7
JoomShopping: 3.2.7