Hi. Many vendors send to Portugal and Greece. Just choose the right country when you're on the items list and you will see the available ones. Still, if you don't want to have problems with customs, you should buy from a vendor that sends from within the schengen area. Right now there are 2 or 3 vendors from Spain and one from Germany, that I'm aware of...

Here are some I found:
Spain
ThegoodstuffEU
https://littlebiggy.net/viewSubject/p/4855519
Geenfinger
https://littlebiggy.net/viewSubject/p/4779547
Germany
Northcollective249
https://littlebiggy.net/viewSubject/p/4856935
Don't forget to read the reviews from the vendors page before ordering anything.
It's also a good practice to send a private message to the vendor and say what you want to buy, to see how it goes.
Good luck!