We also booked land only, through Apple in October, for May 7-14. I just checked Apple's site. Strangely enough, the price for the basic room(Junior Suite) has increased, but the Platinum Suite...which we booked...has decreased. The total price is the same as when we originally booked.
We used miles for our plane tickets, so I can't comment if the flights have gone up in price from Colorado. Can't wait to hear reviews and see pictures of the place, already !!!!