Gravity Falls: Mini Book 3 Notebook by Jack-O-AllTrades on DeviantArt
Gravity Falls Journal One" Spiral Notebook for Sale by maplefoot | Redbubble
Gravity Falls 1 Journal: Ultimate Notebook for Fans UK | Ubuy
Journal 3 | Gravity Falls Wiki | Fandom
I made my daughter a refillable leather Gravity Falls journal. Bill is hiding in the back panel, and it takes standard composition notebooks. I know it isn't red enough, but I was working with what I could source from Amazon. : r/gravityfalls