I watched about thirty episodes of Death Note this past month, and I liked it enough to try to make a replica of the notebook myself.
I painted the title using reflective silver paint and a stencil that I cut out of paper. It's a bit smudgy, but it came out better than I expected. The rules are printed using a printer
The actual notebook is from a stationery store. It was just luck that I found one that looks so much like the original book.