My 9 & 7yos love HP, even my 4yo dose, they have been into it for a few years. What they already have, 2 sets of HP trivial pursuit questions, a HP electronic quiz game, pictopia game, lots of HP Lego, duleing wands, costumes, plush toys, we have a number of books, some on spells, marauders map, wand books, those scratch books, dolls, backpack, pencil cases and loads of stationery. They love getting the hp Lego grab bags and like collecting all the characters.
My 7yo wants an invisibility cloak for Christmas which I’ve bought her. I’ve also bought HP house pens & note books from primark, bought a few other bits but they are for girls. I’ve bought quill writing sets from wish, not sure how good they will be but they look good in the boxes. I have got some HP storage box’s & Tom riddle diaries from Aldi, I also got a wooden 3D Dobby. I’m going to buy a proper Dobby but that’s for me 😁
You can also check out the HP fan groups on FB they are loads of ideas.
The trivial pursuit questions live on our dining table and we ask HP questions around the table at dinner time. We also do the HP quizz on audible each day.
You will find absolutely loads of HP stuff around especially close to Christmas.
Also as someone else has said the audible books are great for car journeys or even at home, my oldest listens to them in her room at night before going to sleep.