Great deals at major hotels usually turn up off-season or at the last minute, but here's another tactic families can try: work with a hotel consolidator (also called a hotel broker or discounter).
Consolidators work by securing blocks of hotel rooms at wholesale prices, then reselling them at rates that are in theory, at least lower than the published "rack" rate. Some consolidators will only reserve your room; you pay the hotel directly. Others require a prepaid voucher that you present to the hotel upon arrival. Many consolidators claim savings of 10 to 50 percent (some even more), but as with any bargain, it pays to know what you're getting into.