I have a new C.OVER NOTES Refillable Multipaper Black Notebook with 3 plain paper refills (64 pages each). This is the notebook, not the diary/planner. It measures 100 x 152 mm (about 4 x 6 in). See The Journal Shop for info:
http://thejournalshop.com/acatalog/C.OVER_NOTES_Refillable_M...

FYI, the pocket Moleskine cahiers will fit as refills.

I have not used this at all; it has been stored in the envelope from The Journal Shop. It's a neat notebook. I just can't seem to part with my Miquelrius notebooks so not sure if I'll ever use this C.OVER notebook.

$20 shipped in U.S. via Paypal