What are Invisibility Cloaks? How can I get one?
An Invisibility Cloak is an item that allows a user to enter all four house common rooms. This means a Slytherin can enter Gryffindor, a Ravenclaw to Hufflepuff, and so on. You can purchase an invisibility cloak for 1,000 galleons in Diagon Alley, at Madam Malkin’s Robes for All Occasions. Yes, they are expensive, but they are intended to be rare items, otherwise there would be no purpose in having separate common rooms.
