I picked up these super cute little Hahnemuhle sketch & note books from Andrea at A Work of Heart to use for the doodle petite class. They’re A6 size and have 20 sheets of unlined 125gsm paper.
I first got turned on to these little notebooks when I went to her retreat in April. The paper isn’t mixed media but is thick enough that it can handle paint and ink decently enough (I didn’t get any bleed through yet). She sells the 2 packs for $2 but I don’t think they’re on her site yet so I had to email her for them.