There's one hotel, I forgot which one, which has prices in the "reasonable" range until the end of November. Then on December 1, the prices all shoot to like $900/night until mid-January.
The entire hotel can't be that busy for a month a half this far in advance, can it?
EDIT: It's the Residence Inn Anaheim. Prices for 5 nights are anywhere from $1000 to $1750 for anytime between now and the end of September. Starting October 1, it's $4495 for 5 nights, regardless of which 5 day period is booked.