The new URL is actually:
http://www.mousse-glamour.com/
It is couples only (as with most things in the village right now), the price is 20 euros + 3 actually (no shoes allowed, so there's almost no way to avoid it
). Mousse parties are mid June -> mid September (weekend only in June and September).
To pay for stuff inside, they sell some small "waterproof" boxes (you can bring your own) where you put some stuff like some money.