**Last edit: As of 7PM 11/22 these rooms are available on kayak.com and booking.com. They were up, then down. Now they're back up. If you can't find these rates, they took them down again, but, hey, all hope is not lost because it looks like they are slowly releasing available rooms. Either that or someone at Mission Hills is not communicating effectively with the wholesalers. You must check wholesale sites; I recommend kayak.com. Rooms have NEVER shown as available on westin.com for 2014 (for wkend 1 anyway.) They have a cont with Valley Music Travel.**
Expedia, etc has Westin Mission Hills Villas at regular rates ($199-225 per night) for both weekends in 2014 right now. Must pay in advance. Property is on the shuttle route. These rates will not last. Hotels are usually 200%++ regular rates. Go get a room...
I hope this helps someone out there.
Original edit. Disregard: *EDIT: This hotel is now completely offline. Valley Music Travel has a room block, so they will probably not open up any remaining rooms until March-ish. Keep looking, kids. Anyone care to share whether (and how) I can delete the original post?*