All of the Entertainment rates are "subject to avalibility" so this is their loop hole to keeping rates high for the busy season.
mouseinfo.com has willie's e-mail address. Let him know you frequent web boards (I know he give discounts for mouseinfo and laughingplace.com) He will give you a price break if possible. Remember, summer is the peak season, so the discount may not be as much as off season/low season.
Check the website and book a room thru there, then e-mail Willie your conf. # and last name. This is what I did and he was able to give me a lower price and a room upgrade, but we are going the last week in August (just before Labor Day), so it's a slower time of the summer.