We were able to book our package through AAA and get the dining plan. The main discount is on the room, but our tickets were cheaper also. We booked our trip back in Jan. and we leave in 16 days, so I don't remember exactly how much we saved going through AAA, but I would check again with another TA.
Edited to say: that if you are referring to the free dining the fall, you will not get a discount from AAA because you are getting a discount with the free dining. I tried a month or so ago to get my tickets upgraded to the tickets plus to park hop and the water parks. But I would have had to up my package price first. Silliness I know. . . .
Hope that helps.