This unusual space specialises in four-day sales of overstock from contemporary designers: think Lancel, Claudie Pierlot, Tara Jarmon, Vanessa Bruno and Maje. Here's the catch – you need to be a member (€50 annual fee) to get in on most days. Fridays are usually open to the public, however; register online for access.
Expect queues of an hour or longer outside, and be prepared to do lots of sorting. Discounts are generally quite good, though availability varies widely.