You should get the
CD Audio books! They are awesome

I have all the movies, Audio books, books in hardback and paperback. I fell in love with these stories when they first came out (I was a children's Librarian in a public library)
One spring break I had a Harry Potter week, complete with a costume ball party at the end. I replicated the train too. Each day when the kids came up they received their Hogwarts Express train ticket, they were then led into a dimly lit room and sat down in chairs. Last call came " All aboard!" and the train would "take" off as the train whistle blew and the train music started. I even had a strobe light flicker every once in awhile to get the feeling of passing through sunlit trees.
When the train arrived they entered into the main part of the room and were divided into their houses which is where they sat all week long. We made wands & Wizard/Witch hats.
I found a chocolate store who made chocolate frogs, I painted nuts and bolts to replicate the money. We played harry potter jeopardy. The funniest though was when I had to contest of Bertie Botts beans! I searched every where until I found jalapeño ones. It was priceless!
I had so many activities that week for them it was amazing and such a blast. It was by far my most successful Spring break week. I'd love to scrap those pictures some time.