The only way I really know of (unless you're part of a convention) is to get an AP rate when they come out with the specials. I'm not talking about the generic 10% AP rate, but the ones that give you a big discount like the current AP7. It saved us so much money, even factoring in the extra cost of the pass, that I bought an AP just to get the hotel discount. You don't have to have an AP to book a room at that rate, but you have to have one when you arrive (or add one to your hotel reservation). You can call and ask for the AP rate and decide whether or not it's worth it to you. Note that only 1 member of your party needs to have an AP to get the discount. Then you also get the added bonus of 10% off on most meals and merchandise.