Nevermind, I found it.
Alamo/Disney Preferred Ticketing
Alamo is Disney's "official" car rental agency. Because of this special relationship, Alamo customers can buy Walt Disney World tickets through a special Disney department called Preferred Ticketing. This department can sell you some of the more unusual tickets, such as 3-Day Park Hopper PLUS tickets.
To order, call (888) 317-6392 or (407) 934-7639. Depending on the phone agent you speak with, you may have to confirm that you have a reservation with Alamo in order to qualify. However, just because you make a reservation with Alamo before you call to buy your tickets, there's nothing to say you can't decide later to cancel your reservation, right? So in reality it's pretty easy for anyone to use this number to order the 3-Day Park Hopper PLUS.
Currently you can buy the 3-Day Park Hopper PLUS for $178.93 adult, $143.79 child, including tax.
Standard shipping to US addresses is free, or they will deliver to many local hotels, or you can pick up the passes at the "will call" window at any of the four theme parks.
