On where you're considering. I'm booked at the Poly for the last week in September and I keep calling to check on pricing for concierge upgrade- they keep telling me that Poly is SOLD OUT for that week! I think partly because some longhouses are undergoing renovations but still I thought that was a slow time. With POFQ going under renovations it limits the rooms for folks with 5 in their family- so maybe if you just need a standard room you'll have better luck at WL/BC/YC or the moderates.
HTH!
Tara- oh and you can go ahead and book your room- pay $200 deposit which is fully refundable if you cancel within 45 days of your travel date. You can also change dates with no penalty up to 45 days- so you really have nothing to lose by booking now.