It's 900€ for 5 hours, every hour after that is 200€ (March 15 prices) . Booking can be done by phone or email 00 33 1 64 74 21 26 or dlp.relations.vip@disney.com.
The price is for a group up to 10 people, so I wonder if you can split the costs? If you can get all 10 people and split it among everyone, it would be worth it in my opinion. Anyone going July 30th and August 1st?