I'm using AAA for the second time. We book room, tickets, and DDP through an AAA agent and get an AAA discount off the room portion of the package. For us, it's coming out to close to $400 off eight nights at the Poly for 5 of us in July.
If you try to call Disney direct and get the AAA discount, they will only sell you a room--no packages. To get the package, you need to go through AAA.