I was able to get the AAA rate on Travelocity for my stay at RPR in October even though that rate wasn't available on Universal's website.
Hotel booking websites will request blocks of rooms that only they can sell. A month or so before the stay date, unbooked rooms are returned to the hotel's inventory. That's why if a hotel shows that it is completely booked up, rooms might still be available from Travelocity, Expedia, Orbitz, etc.