After June 30th (today!), the price for a 4 day pass jumps from $375 to $475, and the price for a single day pass jumps from $135 to $155. Also, master classes with Lydia Kavina go from $65 to $85, and private 1/2 hour lessons with Ms. Kavina go from $35 to $45.
Update - The special room rate of $139/night at the Doubletree Hotel will expire on July 5th. So if you haven't booked your room yet, you might want to jump on this deal while you still can.