Recommendations on TN covers (from Europe)

One of my 2025 objectives is to switch all my regular notebooks and journals to a TN system but the first purchase is quite intimidating. Especially the cover.

I've been doing research on it for months and I've found plenty of people recommend covers other than the og TN brand (still same format and size) but everything I've found if from overseas/outside Europe.

I'm not ready yet to pay a kidney in customs so I was looking for recommendations on any brands/shops/etc. from Europe of if y'all recommend the og one.

Also, leather or not? I don't have anything agaist it but sounds pretty intimidating for my first try at this journaling system.

Edit: To add that I meant EU/European Union (for the customs aspect) Also I'm from Spain