I know they won't take bookings until they get some indication of the prices for the upcoming year... I'd imagine about this time next year as when we booked 3 weeks ago, some of the companies I spoke to didn't have all of their 2003 prices yet
It might be worth calling a couple of travel agents (or emailing them if they/tour operators) have websites. You're less likely to get a saturday girl if you email (I'd imagine at any rate!)