Lego Fantastic Beasts Newt’s Case of Magical Creatures 75952 Building Kit (694 Piece)

Q: The price says $39.99 but when I add it to my cart it changes to $49.49?

Most likely when you tried to checkout some else already purchased it while you added it to your card. Thus, your cart updated to the next available price. Current price right now $50 (plus shipping if not prime) on Amazon but that may not be the case for much longer if people keep buying them.

Q: Suitable for a 6-year-ood?

Hi there! We usually recommend this set for builders ages 8 to 14. If your 6 year-old builder has had a lot of practice with LEGO® sets, they may be A-Okay with this one; if not, they may find it a bit too challenging. Kind regards, Emily LEGO® Customer Service

Q: Is this set a harry potter lego set or a movie of it's own? i'm not familiar with these characters and haven't seen the movies.

The Fantastic Beasts and Where To Find Them is a move that is a prequel to the Harry Potter Films. It was written and produced by J. K. Rowling. If you look it up on Wikipedia there is a lot of information.