The LEGO Harry Potter Hogwarts Chamber of Secrets set (76389) is a brand new, sealed product that features 1176 pieces.

Designed for ages 9 and above, this complete, brand new sealed in box set celebrates the 20 Years of LEGO Harry Potter Sets

It has limited edition features:
Glow in the Dark Features
Anniversary Golden Lord Voldemort Figure
6 Collectable Wizard Cards

This is a retired product and can no longer be purchased from the Official Lego Website