Hi Kim
you don't need an Orlando entertainment book, any book will do as apparently they all have the coupon. I understand that often they don't even ask to see anything when you check in.
When I phoned to get rates I was told the discounts are usually released about 90 days in advance, but that's not true. People are already posting that they got discounts for next June. I'm waiting for discounts for March/April. I think it has something to do with how busy they expect to be during that period. March/ April is spring break, so they may not offer discounts at all. It's a "wait and see" game right now.
You didn't mention when you were travelling, but depending on how busy you expect it might be, you might want to consider reserving the room now, then just keep calling them back to see if there's a discount they can apply to your reservation. I currently have 2 reservations for the same time period, one at HRH and the other at PBH, just in case discounts become available at one hotel, and not the other. The waiting is killing me though.