Do a google search and find a nursery that sells both and is willing to ship to Greece.

I have had plants from the USA before and they have always arrived in good condition I would send them first class priority air mail so they should arrive in 2/3 days if you look on EBay you can buy specially designed plastic packaging for plants in all different sizes that should make packaging them easier and also check with either your friend or Greek customs about importing live plants into Greece.