This is my beautiful special-edition Enclavia notebook. I hand one out to every new student, together with an Enclavia folder.
The notebooks are Moleskine Cahier Extra Large Ruled (19x25 cm) in Kraft Brown (the set of 3 is ~15 euros). I then personalise them with round stickers by Moo with my Enclavia logo.
I love them, my students love them and I feel good when I hand them out. All in all, they are a bit on the expensive side, but at the end of the day a good first impression is more important than saving a few euros per notebook.