Yeah you're right Pixie I didn't think of that! We are still searching around, looking at Hotwire a little bit too. One thing I have noticed was that a few of the rooms have "1 room left." on them. What is going on that week? Is this going to make the park crowded? I've never seen that, even when we went and it was crowded in May.
When you see 1 room left on any of these 3rd party sites that you can book through that means that whatever allotment of rooms that the hotel made available to them at that rate are almost gone.
The hotels aren't going to release all of their rooms all of their rooms all at once to these sites and they wont release them at any single price. The number of rooms they release for booking through these sites and the price that they are able to get them for is going to be based on how busy or booked the hotel is for those dates. If they aren't able to book people directly or through other sites fast enough or its getting close to the dates they can and will release more rooms. The opposite applies too, if they are getting close to capacity then they will limit the number of rooms they release at discount rates or to discount sites.
Basically, if you saw "1 room left at this rate" it could mean anything! It might be a busy time and they won't have anymore rooms at that rate. It could just mean that all of the rooms originally released at that rate are gone and the hotel hasn't released additional inventory for whatever reason yet. It is still possible if you check again tomorrow, in a few days, or next week that you could get the same rate for the same place.
If you know what hotel it is try to get a quote directly from them to see what availability is like. If they have certain rates or room types that are unavailable then you have a better idea how full they are.
If everything is still available and at their standard rates, then there is that chance that they will release more rooms to the discount sites later...
It really is all a game, how long are you willing to wait, is it worth the risk or not if it does end up being a busy time, etc...
Since you already have a room booked far away its less of a gamble and you can afford to wait a little longer since you are aren't going to be stuck with absolutely nothing. At least you have all the way up to your cancellation date there to make a decision.
Even though you have time and the security of your other reservation, if you see something that is good enough do it! Remember though that Priceline, Hotwire, etc aren't going to let you cancel as easily or at all. So once you book with them you are stuck with what you have!