Hi Achi and welcome to GoY. We are a bunch of friendly gardeners both amateur and professional who like to talk about gardening. If you are looking to buy blue spruce you could try the Garden Centre above or google. I've no knowledge of Greece garden centres or what they stock.

Whereabouts in Greece do you live? I know that there are a number of large garden Centres near Athens. One near Aghios Constantinous and several around Volos. The Athens news also gave the name of specialist plant supplier a couple of years ago and they might be bale to help you